Mobile High-Pressure Road Surface Cleaning System Employing Integrated Closed Loop And Open Loop Hydrostatic Pumps

Abstract

A mobile high-pressure road surface cleaning system includes a vehicle including a motor, a transmission, and a bed. A split gear transfer case is operatively connected to the motor. The split gear transfer case includes at least a first output member, and a second output member. A first pump connected to the first output member. A second pump is connected to the second output member. A third pump connected to the second pump. A water jet system is operatively coupled to the first pump. The water jet system is configured to remove debris adhered to road surfaces. A vacuum system is operatively connected to the second pump. The vacuum system is configured to collect the debris. A creep drive system is connected to the split gear transfer case and the third pump.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of U.S. Provisional Application No. 63 / 762,704, filed on February 25, 2025. The entire disclosures of each of the above applications are incorporated herein by reference.FIELD

[0002] The present disclosure relates to the art of mobile cleaning systems and, more particularly, to a mobile high-pressure road surface cleaning system that employs integrated closed loop and open loop hydrostatic pumps.BACKGROUND

[0003] This section provides background information related to the present disclosure which is not necessarily prior art.

[0004] Mobile road surface cleaning systems, such as systems that remove rubber and striping from road surfaces include a water pump that provides ultra-high-pressure water at pressures up to 40,000 PSI through hoses to removal heads. The removal heads includes nozzles that direct the high-pressure water onto road surfaces to remove rubber, paint, and / or other debris. The truck is a complete system offering clean water, a debris tank, a vacuum, rotating cleaning heads, and a creep drive allowing the truck to completely remove rubber, paint, and other debris leaving behind a clean undamaged surface. Using ultra-high-pressure water instead of grinding or media blasting leaves behind an undamaged surface.

[0005] Traditional rubber and stripe removal trucks use a secondary engine on a rear of the truck, or a mechanical gear box to power the vacuum and ultra-high-pressure water pump from the truck engine itself. These systems rely on a power take off (PTO) that provides an interface between the secondary engine or gear box and each high-pressure pump and vacuum. The use of a secondary engine and / or mechanical gear box adds complexity and cost to the cleaning operation requiring multiple operations to be manually implemented before initiating the cleaning operation. Further, the use of a secondary engine and / or mechanical gear box adds weight and maintenance requirements to the vehicle.SUMMARY

[0006] This section provides a general summary of the disclosure and is not a comprehensive disclosure of its full scope or all of its features.

[0007] A mobile high-pressure road surface cleaning system, in accordance with the present disclosure, includes a vehicle including a motor, a transmission, and a bed. A split gear transfer case is operatively connected to the motor. The split gear transfer case includes at least a first output member, and a second output member. A first pump connected to the first output member. A second pump is connected to the second output member. A third pump connected to the second pump. A water jet system is operatively coupled to the first pump. The water jet system is configured to remove debris adhered to road surfaces. A vacuum system is operatively connected to the second pump. The vacuum system is configured to collect the debris. A creep drive system is connected to the split gear transfer case and the third pump.

[0008] In other features, the first pump is a first closed loop hydrostatic pump, and the second pump is a first open loop pump.

[0009] In other features, the second pump is operatively connected to a creep drive of the vehicle.

[0010] In other features, the third pump is a second high-pressure closed loop hydrostatic pump operatively connected to the first closed loop hydrostatic pump.

[0011] In other features, a fourth pump is operatively connected to the second pump.

[0012] In other features, a fifth pump is operatively connected to the fourth pump.

[0013] In other features, a cleaning arm is operatively connected to the third pump.

[0014] In other features, the fourth pump comprises a third high-pressure closed loop hydrostatic vacuum pump.

[0015] In other features, the fifth pump comprises a high-pressure gear pump.

[0016] In other features, a controller operatively connected to each of the first high-pressure closed loop hydrostatic pump, the second pump, the second high-pressure closed loop hydrostatic pump, the third high-pressure closed loop hydrostatic pump, and the fifth pump, the controller selectively controlling each of the first high-pressure closed loop hydrostatic pump, the second pump, the second high-pressure closed loop hydrostatic pump, the third high-pressure closed loop hydrostatic pump, and the fifth through a single interface.

[0017] A mobile high-pressure road surface cleaning system includes a vehicle including a motor, a transmission, and a bed. A split gear transfer case is operatively connected to the motor. The split gear transfer case includes at least a first output member, and a second output member. A first plurality of pumps is connected to the first output member and the second output member. A second plurality of pumps is connected to select ones of the first plurality of pumps. A cleaning arm including a water jet system and a vacuum system is operatively connected to select ones of the first plurality of pumps and the second plurality of pumps. A creep drive system is operatively connected to the split gear transfer case. The creep drive system is operable to propel the mobile high-pressure road surface cleaning system along a road surface to remove debris at a rate of between about 0 feet-per-minute (FPM) and about 500 FPM. A controller is operatively connected to each of the first plurality of pumps, the second plurality of pumps, and the creep drive system. The controller selectively controls each of the first plurality of pumps, the second plurality of pumps, and the creep drive system through a single interface.

[0018] In other features, the first plurality of pumps includes a first high-pressure hydrostatic pump connected to the first output member and a second pump connected to the second output member.

[0019] In other features, the second plurality of pumps includes a second high-pressure hydrostatic pump connected to the second pump.

[0020] In other features, the second plurality of pumps further includes a third high-pressure hydrostatic pump operatively connected to the second high-pressure hydrostatic pump.

[0021] In other features, the second plurality of pumps includes a fifth pump operatively connected to the third high-pressure hydrostatic pump.

[0022] In other features, the first high-pressure hydrostatic pump comprises a first high-pressure closed loop hydrostatic pump and the second high-pressure hydrostatic pump comprise a first open loop pump .

[0023] In other features, the third high-pressure hydrostatic pump comprises a closed loop vacuum pump.

[0024] In other features, the fifth pump comprises a high-pressure gear pump.

[0025] In other features, a blower is operatively connected to a blower motor on the vehicle.

[0026] In other features, a water pump is operatively connected to a water pump motor supported on the vehicle.

[0027] Further areas of applicability will become apparent from the description provided herein. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations and are not intended to limit the scope of the present disclosure.

[0029] FIG. 1 is a driver’s side view of a mobile road surface cleaning vehicle including a high-pressure cleaning system, in accordance with the present disclosure;

[0030] FIG. 2 is a plan view of split gear drive transfer case integrating open loop and closed loop pumps of the high-pressure cleaning system, in accordance with the present disclosure;

[0031] FIG. 3 is a schematic diagram illustrating the cleaning system including integrated open loop and closed loop hydrostatic pumps, in accordance with the present disclosure;

[0032] FIG. 4 ls a lower right perspective view of a hydrostatically driven ultra-high-pressure water pump with a closed loop hydrostatic motor of the high-pressure cleaning system, in accordance with the present disclosure;

[0033] FIG. 5 ls a lower right perspective view of a hydrostatically driven vacuum system with a closed loop hydrostatic motor of the high-pressure cleaning system, in accordance with the present disclosure;

[0034] FIG. 6A is a flow chart illustrating a first portion of a method of operating the mobile road surface cleaning vehicle, in accordance with the present disclosure;

[0035] FIG. 6B is a flow chart illustrating a second portion of a method of operating the mobile road surface cleaning vehicle, in accordance with the present disclosure; and

[0036] FIG. 6C is a flow chart illustrating a third portion of a method of operating the mobile road surface cleaning vehicle, in accordance with the present disclosure.

[0037] Corresponding reference numerals indicate corresponding parts throughout the several views of the drawings.DETAILED DESCRIPTION

[0038] Example embodiments will now be described more fully with reference to the accompanying drawings.

[0039] With initial reference to FIGS. 1 and 2, a mobile high-pressure road surface cleaning system is indicated generally at 10. It should be understood that term “road surface” can be used to describe vehicle travel ways, runways, parking lots, and the like. Road surface may also include surfaces formed from concrete “black top”, stone, and the like. Mobile high-pressure road surface cleaning system 10 includes a vehicle 12 having a motor 14, a transmission 16, a bed 18, and a cab 20. Bed 18 supports a split gear transfer case 22. While shown as being mounted to bed 18, split gear transfer case 22 may be arranged in other locations on vehicle 12. Split transfer case 22 is operatively connected to a water jet and vacuum system 24. As will be detailed more fully herein, split gear transfer case 22 facilitates the use of closed loop hydrostatic pumps that cooperate to form a closed loop hydrostatic drive system for vehicle 12.

[0040] With reference to FIG. 3 and with continued reference to FIG. 2, in accordance with the present disclosure, split gear transfer case 22 includes a first output member 30, a second output member 32, and a third output member 34. First output member 30 is operatively connected to a first stacked pump system 36 and second output member 32 is operatively connected to a second stacked pump system 38.

[0041] First stacked pump system 36 includes a first pump 40 and a second, pump 42. Second stacked pump system 38 includes a third pump 44, a fourth pump 46, and a fifth pump 48. A creep drive motor 50 is operatively connected to third output member 34. Creep drive motor 50 forms part of a creep drive system (not separately labeled) cooperates with second pump 44 and transmission 16 to move vehicle 12 along a road surface (not shown) during a cleaning operation.

[0042] In accordance with an aspect of the present disclosure, water jet and vacuum system 24 also includes a blower 52 and a water pump 53 that may be mounted to bed18. Blower 52 and water pump 53 are connected to a gear boxes (not separately labeled). The connection to the gear boxes allows blower 52 and water pump 53 to be operated at speeds independent of motor 14. Vehicle 12 is further shown to include a cleaning arm 54 that supports a jet nozzle 56 and a vacuum 58. Jet nozzle 56 directs streams of high-pressure fluid toward a road surface to remove adhered debris such as paint, rubber, and the like. Vacuum 58 is connected to a vacuum system 59 on bed 18 that is activated to clean up and remove the debris from the road surface. A fluid line 61 fluidically connects jet nozzle 56 with water jet and vacuum system 24. Likewise, a vacuum line 64 fluidically connected vacuum system 59 with water jet and vacuum system 24.

[0043] In accordance with the preset disclosure, bed 18 supports a container that contains a water storage portion 68 and a debris storage portion 69. Water storage portion 68 stores an amount of water that is passed through jet nozzle 56 to clean the road surfaces, debris storage portion 69 receives the debris that is collected by vacuum system 58.

[0044] In accordance with an aspect of the present disclosure, first pump 40 takes the form of a first high-pressure closed loop hydrostatic pump 70. Second pump 42 takes the form of an open-loop pump 72. Third pump 44 takes the form of a second high-pressure closed loop hydrostatic pump 74. Fourth pump 46 takes the form of a third high-pressure closed loop hydrostatic pump 78, and fifth pump 48 takes the form of a high-pressure gear pump 80. Third high-pressure closed loop hydrostatic pump 78 takes the form of a vacuum pump.

[0045] In accordance with an aspect of the present disclosure illustrated in FIG. 4, first high-pressure closed loop hydrostatic pump 70 is operatively connected to first outlet member 30. First high-pressure closed loop hydrostatic pump 70 drives hydrostatic motor 82. First high-pressure hydrostatic pump 70 also includes a water inlet 84 fluidically connected to water storage portion 68 and a water outlet 85, fluidically connected to jet nozzle 56.

[0046] FIG. 5 depicts vacuum system 59 and a motor 87 having a hydrostatic coupler 88. Coupler 88 operatively connects motor 87 with vacuums system 59. Third high-pressure closed loop hydrostatic pump 78 is operatively associated with vacuum system 59 and operatively connected to second high-pressure closed loop hydrostatic pump 74 as shown in FIG. 3. Vacuum system 59 includes a vacuum inlet 90 fluidically connected to vacuum 58 and a vacuum outlet 92 fluidically connected to vacuum line 64.

[0047] In addition to pressuring water to remove debris and generating a vacuum to collect the removed debris, high-pressure open-loop pump 72 operates other features of cleaning arm 54 such as controlling an overall position of jet nozzle 56 and vacuum 58. High pressure gear pump 80 may operate as a charge pump (not separately labeled) that supplies hydraulic fluid to one or more of first high-pressure closed loop hydrostatic pump 70, second high-pressure closed loop hydrostatic pump 74, and third high-pressure closed loop hydrostatic pump 78.

[0048] In accordance with the present disclosure, water jet and vacuum system 24 is operatively connected to a controller 100 including an input member 110 that may take the form of a touch screen display. Controller 100 allows an operator to set, activate, and run a cleaning operation through a single interface without the need to manually set valves, controls, and the like. The use of closed loop pumps associated with delivering high-pressure water onto the road surface, generating a vacuum to collect any dislodges debris, control transmission 16, and operate the creep drive reduces operator workload and simplifies what was in the past an overly complicated operation.

[0049] Split-gear box 22 has hydrostatic pump pads (not separately labeled) that control fluid pressure and also offer an integrated creep drive control that allows for complete control of the speed of debris removal from 0 feet-per-minute (FPM) to over 500 FPM. That is, the integrated creep drive can propel the mobile high-pressure cleaning system along a road surface to remove debris at a rate of about 0 FPM to more than 500 FPM.

[0050] The multiple hydrostatic pump drives provided by split gear transfer case 22 provides a platform for supporting and operating stacked hydrostatic pumps to power the entire truck hydrostatically, including the ultra-high-pressure pump, which is driven through a closed-loop hydrostatic drive system.

[0051] The closed-loop hydrostatic drive system is a hydrostatic drive that is much more efficient than open loop hydrostatic systems. It also allows for full control of pressure and speed of the pumps driving the ultra-high-pressure pump as well as the creep drive and vacuum systems. With this, we can operate the systems at only the required speed to accomplish the cleaning required, saving fuel and noise emissions vs. the other systems that are dependent on the mechanical drive and engine speeds. Utilizing this advantage, we have complete control over all functions, including operating speeds of the pumps and motors for the entire system.

[0052] Through hydrostatic pressures, temperatures, and controls, we can display water pressures, pump speeds, and temperatures, remotely through a display located in cab 20. As shown in FIG. 6A, 6B, and 6C, controller 100 allows the operator to pick the water pressure desired, and instead of adjusting engine RPM and pressure valves to the desired pressure, controller 100 will automatically adjust to the water pressure chosen. Controller 100 will automatically bring the pumps up to the required speed and flow to make the desired pressure for cleaning.

[0053] Also, through the programming illustrated in FIG. 6A-6C of controller 100 coupled with hardware such as the high-pressure pumps, creates a synergy that is much easier to run and also includes protections that will not allow the operators to damage components unlike traditional systems.

[0054] The use of closed loop hydrostatic systems allows the motor 14 to be operated at a much lower operating speed than is required by traditional systems while, at the same time, providing the needed water, hydrostatic, and vacuum flows. Unlike traditional systems that must be run at higher speeds, the component synergy provided by the closed loop pumps and creep systems leads to a much quieter, e.g., about 79dB and cooler running system that conserves fuel. The particular noise output is a model specific metric. By not being tied directly to engine speed, the use of the closed loop hydrostatic / hydrostatic pumps also allows the water jet and vacuum system to be operated at much lower pump speeds and flows.

[0055] In addition, controller 100, as shown in FIGS. 6A-6C, provides full control over the entire system including the truck engine and transmission. This level of complete control ensures that the operators have an easier less stressful operating experience as well as providing protections to system components. That is, controller 100 ensures the engagement and disengagement of the water jet and vacuum system components prior to initiating the creep drive or system shut down.

[0056] Controller 100 controls a 4th Gear lock-up, e.g., 1:1 drive ratio of transmission 16, and / or pump Mode, also known as a fire truck mode, of the transmission, electronically, through programming, allowing for power from the engine through the transmission to the gear box only once selected parameters have been met. Controller 100 also controls engine RPM so that once the selected parameters are met. Engine speed may be selected thereby ensuring smooth and complete engagement of system components. Further, controller 100 can verify, to the operator engagement of the split gear transfer case through the use of sensors prior to engaging the creep drive or commanding engine speed.

[0057] In contrast to other systems which require many inputs to set engine speed, transmission speed, pump speed and the like, controller 100 allows for a single button activation to start and operate the water jet and cleaning system. From a single touch screen, e.g., input member 110, operators have full control over all aspects of the operation.

[0058] In accordance with an aspect of the disclosure, controller 100 controls a method 200 of operating mobile road surface cleaning vehicle 10 in accordance with the present disclosure. In block 220, an operator starts mobile road surface cleaning vehicle 10. In block 222, the operator selects “Main Screen” on a control touch screen (not shown) in cab 20. In block 224, the operate will select a desired discharge pressure. The desired discharge pressure may depend on the operation about to be started. In block 226, the operator sets the parking brake, and in block 227 the operator depresses a brake pedal (not shown) in cab 20. In bloc 228 the operator will select a start function on the touch screen. Once the start function is selected, controller 100 will begin a series of preliminary checks.

[0059] During the series of preliminary checks, controller 100 confirms the transmission 16 is in neutral in block 230, confirms that the brake pedal is depressed in block 232, confirms that the parking brake is set in block 234, confirms that the creep drive motor 50 is set to minimum speed in block 236, confirms that the drive shaft ix set to minimum speed in block 240 and confirms that the high pressure water switch is off in block 238. If any of the preliminary checks returns a negative response, the operator is alerted to take corrective action in block 242.

[0060] After completing and passing the preliminary checks, a pump mode request is sent to transmission 16 in block 250. Following the pump mode request, a power take-off (PTO) signal is sent in block 252. In block 254, a PTO engaged signal is confirmed. If the PTO switch is not conformed, a drive signal is sent to transmission 16 followed by a neutral signal in block 256. If the PTO engaged signal is confirmed, a pump mode enable signal is sent to transmission 16 in block 260.

[0061] After the pump mode enable signal is sent to transmission 16 in block 260, a drive signal is sent to transmission 16 in block 262. In block 264, controller 100 confirms that transmission 16 is n 4th gear. If transmission 16 is not in 4th gear, the operator is prompted to take corrective action in block 266. If the transmission 16 is confirmed to be in 4th gear in block 264, a speed command signal is sent to motor 14 in block 270. In block 272, controller 100 send a speed command to fourth-high-pressure hydrostatic pump 44 (vacuum pump). In block 274, a creep drive engage signal is sent. In block 276, the creep drive engaged signal is confirmed by controller 100. If the creep drive engaged signal is not confirmed, the operator is prompted to take corrective action in block 278.

[0062] Once the creep drive is confirmed to be engaged in block 276, controller 100 enables creep drive speed control in block 280. In block 282, controller 100 enables pump speed control and in block 284, the operator releases the parking brake and starts a cleaning operation. The disclosed control allows an operator to control all aspects of mobile high-pressure road surface cleaning system 10 through a single interface thereby creating a more efficient and simplified cleaning operation.

[0063] Exemplary embodiments are provided so that this disclosure will be thorough and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that exemplary embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some exemplary, well-known processes, well-known device structures, and well-known technologies are not described in detail.

[0064] When the terms "about" or “substantially” are used in this specification in connection with a numerical value, it is intended that the associated numerical value includes a manufacturing or operational tolerance (e.g., ±10%) around the stated numerical value. Moreover, when the terms "generally" or "substantially" are used in connection with geometric shapes, it is intended that precision of the geometric shape is not required but that latitude for the shape is within the scope of the disclosure. Furthermore, regardless of whether numerical values or shapes are modified as "about," “generally,” or "substantially," it will be understood that these values and shapes should be construed as including a manufacturing or operational tolerance (e.g., ±10%) around the stated numerical values or shapes.

[0065] The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a,” "an," and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," “including,” and “having,” are inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless specifically identified as an order of performance. It is also to be understood that additional or alternative steps may be employed.

[0066] When an element or layer is referred to as being "on," “engaged to,” "connected to," or "coupled to" another element or layer, it may be directly on, engaged, connected, or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on," “directly engaged to,” "directly connected to," or "directly coupled to" another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., “between” versus “directly between,”“adjacent” versus “directly adjacent,” etc.). As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0067] Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer, or section. Terms such as “first,”“second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer, or section discussed below could be termed a second element, component, region, layer, or section without departing from the teachings of the example embodiments.

[0068] Spatially relative terms, such as “inner,”“outer,” "beneath," "below," "lower," "above," "upper," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below”, or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0069] The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.

Claims

1. A mobile high-pressure road surface cleaning system comprising:a vehicle including a motor, a transmission, and a bed;a split gear transfer case operatively connected to the motor, the split gear transfer case including at least a first output member, and a second output member;a first pump connected to the first output member;a second pump connected to the second output member;a third pump connected to the second pump;a water jet system operatively coupled to the first pump; the water jet system being configured to remove debris adhered to road surfaces;a vacuum system operatively connected to the second pump, the vacuum system being configured to collect the debris; anda creep drive system connected to the split gear transfer case and the third pump.

2. The mobile high-pressure road surface cleaning system according to claim 1, wherein the first pump is a first high-pressure closed loop hydrostatic pump, and the second pump is a first open loop pump.

3. The mobile high-pressure road surface cleaning system according to claim 2, wherein the second pump is operatively connected to a creep drive of the vehicle.

4. The mobile high-pressure road surface cleaning system according to claim 2, wherein the third pump is a second high-pressure closed loop hydrostatic pump operatively connected to the first high-pressure closed loop hydrostatic pump.

5. The mobile high-pressure road surface cleaning system according to claim 4, further comprising: a fourth pump operatively connected to the second pump.

6. The mobile high-pressure road surface cleaning system according to claim 5, further comprising: a fifth pump operatively connected to the fourth pump.

7. The mobile high-pressure road surface cleaning system according to claim 6, further comprising a cleaning arm operatively connected to the third pump.

8. The mobile high-pressure road surface cleaning system according to claim 6, wherein the fourth pump comprises a third high-pressure closed loop hydrostatic vacuum pump.

9. The mobile high-pressure road surface cleaning system according to claim 8, wherein the fifth pump comprises a high-pressure gear pump.

10. The mobile high-pressure road surface cleaning system according to claim 9, further comprising a controller operatively connected to each of the first high-pressure closed loop hydrostatic pump, the second pump, the second high-pressure closed loop hydrostatic pump, the third high-pressure closed loop hydrostatic pump, and the fifth pump, the controller selectively controlling each of the first high-pressure closed loop hydrostatic pump, the second pump, the second high-pressure closed loop hydrostatic pump, the third high-pressure closed loop hydrostatic pump, and the fifth through a single interface.

11. A mobile high-pressure road surface cleaning system comprising: a vehicle including a motor, a transmission, and a bed;a split gear transfer case operatively connected to the motor, the split gear transfer case including at least a first output member, and a second output member;a first plurality of pumps connected to the first output member and the second output member;a second plurality of pumps connected to select ones of the first plurality of pumps;a cleaning arm including a water jet system and a vacuum system operatively connected to select ones of the first plurality of pumps and the second plurality of pumps;a creep drive system operatively connected to the split gear transfer case, the creep drive system being operable to propel the mobile high-pressure road surface cleaning system along a road surface to remove debris at a rate of between about 0 feet-per-minute (FPM) and about 500 FPM; anda controller operatively connected to each of the first plurality of pumps, the second plurality of pumps, and the creep drive system, the controller selectively controlling each of the first plurality of pumps, the second plurality of pumps, and the creep drive system through a single interface.

12. The mobile high-pressure road surface cleaning system according to claim 11, wherein the first plurality of pumps includes a first high-pressure hydrostatic pump connected to the first output member and a second pump connected to the second output member.

13. The mobile high-pressure road surface cleaning system according to claim 12, wherein the second plurality of pumps includes a second high-pressure hydrostatic pump connected to the second pump.

14. The mobile high-pressure road surface cleaning system according to claim 13, wherein the second plurality of pumps further includes a third high-pressure hydrostatic pump operatively connected to the second high-pressure hydrostatic pump.

15. The mobile high-pressure road surface cleaning system according to claim 14, wherein the second plurality of pumps includes a fifth pump operatively connected to the third high-pressure hydrostatic pump.

16. The mobile high-pressure road surface cleaning system according to claim 15, wherein the first high-pressure hydrostatic pump comprises a first high-pressure closed loop hydrostatic pump and the second high-pressure hydrostatic pump comprise a first open loop pump .

17. The mobile high-pressure road surface cleaning system according to claim 16, wherein the third high-pressure hydrostatic pump comprises a closed loop vacuum pump.

18. The mobile high-pressure road surface cleaning system according to claim 16, wherein the fifth pump comprises a high-pressure gear pump.

19. The mobile high-pressure road surface cleaning system according to claim 11, further comprising a blower operatively connected to a blower motor on the vehicle.

20. The mobile high-pressure road surface cleaning system according to claim 11, further comprising a water pump operatively connected to a water pump motor supported on the vehicle.

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