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Diesel engine exhaust contains products of combustion which may cause personal injury. Always start and operate the engine in a well ventilated area, and, if in an enclosed area, vent the exhaust to the outside. |
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Personal injury can result from rotating and moving parts. Stay clear of all rotating and moving parts. Never attempt adjustments while the machine is moving or the engine is running unless otherwise specified. The machine must be parked on a level surface and the engine stopped. Attach a "Do Not Operate" or similar warning tag to the start switch and controls before servicing, repairing, or making adjustments to the machine. |
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Personal injury or death can result from sudden machine movement. Sudden movement of the machine can cause injury to persons on or near the machine. To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine. |
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Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand. |
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Personal injury or death can result from improperly checking for a leak. Always use a board or cardboard when checking for a leak. Escaping air or fluid under pressure, even a pin-hole size leak, can penetrate body tissue causing serious injury, and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury. |
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Escaping fluid under pressure, even a pinhole size leak, can penetrate body tissue, causing serious injury, and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury. Always use a board or cardboard when checking for a leak. |
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose of all fluids according to local regulations and mandates. |
Specifications
| Machine Test Parameters | ||
|---|---|---|
| Date | Product or Component SN | |
| Measurement Location | Measurement | Actual |
| Engine high idle speed | 2200 ± 50 rpm | |
| Hydraulic oil temperature for test | 38 °C (100 °F) Minimum |
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| Test Specifications | ||
|---|---|---|
| Date | Product or Component SN | |
| Component Location | Specification | Actual |
| The target steering priority flow. | 15 L/min (4 US gpm) |
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| The target hydraulic system flow. | 53.5 L/min (14 US gpm) |
|
Introduction
The gear pump provides priority flow for the steering and charge system. This oil is combined with hydraulic oil flow from the other systems at the charge return filter. The steering system uses a gear pump that has a flow priority valve. 15 L/min (4 US gpm) is directed out of port "CF" which flows to the steering metering unit. The remainder of the flow is directed out of port "EF". The flow of oil from port "CF" combines with the flow of oil from port "EF" before entering the charge filter. The combined flow of oil provides charge oil for the propel system.
This procedure provides a method to test the steer pump rate of priority oil flow and the flow rate for the entire hydraulic system.
Note: The steering pump is the rear section of the tandem pump. The vibratory pump is the front section of the tandem pump.
Required Parts
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| Illustration 1 | g03761581 |
Flow meter configuration for steering and charge priority flow | |
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| Illustration 2 | g03761685 |
Flow meter configuration for hydraulic system flow | |
| Required Tools | ||||
|---|---|---|---|---|
| Tool | Item | Qty | Part No | Description |
| A | 1 (1) | 6V-7788 | Flow Meter Gp 5 L/min (1.3 US gpm) to 60 L/min (15.8 US gpm) |
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| B | B1 | 2 (2) | 8C-6874 | Connectors |
| B2 | 2 (3) | 6V-9746 | O-Ring Seals | |
| C | C1 | 2 | 6V-8942 | O-Ring Reducer |
| C2 | 2 | 6V-8398 | O-Ring Seals | |
| D | 2 | 6V-8556 | Nuts | |
| E | 2 | 124-2117 | Couplings | |
| F | 1 | 122-2117 | Hydraulic Hoses 1 m (3.3 ft) |
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| G | G1 | 2 | 6V-8943 | Reducers |
| G2 | 2 | 7J-9108 | O-Ring Seals | |
| H | 1 | 124-2150 | Permanent Coupling | |
| J | 1 | 124-2119 | Permanent Coupling | |
| K | 1 | 124-7115 | Hydraulic Hose 1 m (3.3 ft) |
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| L | 1 | 5P-3413 | Pipe Sealant | |
| ( 1 ) | Two flowmeters are necessary if the steering and charge priority flow rate and the hydraulic system flow rate are to be simultaneously tested. |
| ( 2 ) | Four connectors are necessary if the steering and charge priority flow rate and the hydraulic system flow rate are to be simultaneously tested. |
| ( 3 ) | Four O-ring seals are necessary if the steering and charge priority flow rate and the hydraulic system flow rate are to be simultaneously tested. |
Charge and Steering Priority Flow
- Apply Tool (L) to the pipe thread on each Tool (B) .
- Install one Tool (B) in each end of Tool (A) .
- Install one Tool (C) on each end of Tool (D) .
- Connect Tool (D) to Tool (B) in the inlet and outlet sides of Tool (A) .
- Connect Tool (E) to each end of Tool (F) .
- Connect one Tool (E) to Tool (C) .
Hydraulic System Charge Flow
- Apply Tool (L) to the pipe thread on each Tool (B) .
- Install one Tool (B) in each end of Tool (A) .
- Connect Tool (G) to Tool (B) in the inlet and outlet sides of Tool (A) .
- Connect Tool (H) to one end of Tool (K) .
- Connect Tool (J) to the other end of Tool (K) .
- Connect Tool (H) to Tool (G) in the outlet side of Tool (A) .
Test Preparation
Note: The operator platform can be tilted in order to provide greater access to components under the operator platform. However, the operator platform must be lowered and fastened before the machine is operated. Refer to Operation and Maintenance, "Platform Tilt" and Operation and Maintenance, "Platform Lower".
- Drive the machine to a smooth, horizontal surface.
- Move propel lever (1) to the NEUTRAL position.
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| Illustration 3 | g03749808 |
- Move parking brake switch (4) to the ON position.
- If the machine is equipped with a leveling blade, use blade control lever (3) to lower the blade to the ground.
- Move throttle control switch (5) to the LOW-IDLE position.
Note: The engine rpm will appear on machine display (2) .
- Allow the engine to run for 5 minutes. Move engine start switch (6) to the OFF position.
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| Illustration 4 | g03749872 |
- Block the wheels. Block the drum.
Charge and Steering Priority Flow
- Raise the platform. Refer to Operation and Maintenance, "Platform Tilt".
- Disconnect hose (7) from steering outlet, port "CF" (8) of steering pump (9) .
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| Illustration 5 | g03749968 |
- Connect hose (7) to the outlet side of Tool (A) .
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| Illustration 6 | g03749977 |
- Connect the inlet side of Tool (A) to steering outlet, port "CF" (8) of steering pump (9) .
- Lower the platform. Refer to Operation and Maintenance, "Platform Lower".
Hydraulic System Flow
- Unhook latch (10) and open right engine panel (11) .
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| Illustration 7 | g03749954 |
- Secure right engine panel (11) with prop (12) .
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| Illustration 8 | g03749955 |
- Disconnect hose (14) from inlet port (13) of charge filter (15) .
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| Illustration 9 | g03749990 |
- Connect hose (14) to the inlet side of Tool (A) .
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| Illustration 10 | g03749993 |
- Connect the outlet side of Tool (A) to inlet port (13) of charge return filter (15) .
Test Procedure
Priority Steering Flow
- Move engine start switch (6) to the START position. Release the switch when the engine starts.
- Operate the engine at low idle for a few minutes. Move throttle control switch (5) to the HIGH-IDLE position. Engine speed should be 2200 ± 50 rpm.
Note: The engine rpm will appear on machine display (2) .
- Operate the machine until the oil temperature reaches 38 °C (100 °F).
Note: The oil temperature will appear on machine display (2) .
- Read the steering priority flow on Tool (A). The flow should be 15 L/min (4 US gpm).
- Move throttle control switch (5) to the LOW-IDLE position.
Note: The engine rpm will appear on machine display (2) .
- Allow the engine to run for 5 minutes. Move engine start switch (6) to the OFF position.
- Raise the platform. Refer to Operation and Maintenance, "Platform Tilt".
- Remove the tooling. Reconnect hose (7) .
- Lower the platform. Refer to Operation and Maintenance, "Platform Lower".
Hydraulic System Charge Flow
- Move engine start switch (6) to the START position. Release the switch when the engine starts.
- Operate the engine at low idle for a few minutes. Move throttle control switch (5) to the HIGH-IDLE position. Engine speed should be 2200 ± 50 rpm.
Note: The engine rpm will appear on machine display (2) .
- Read flow on Tool (A). The flow should be 53.5 L/min (14 US gpm).
- Move throttle control switch (5) to the LOW-IDLE position.
Note: The engine rpm will appear on machine display (2) .
- Allow the engine to run for 5 minutes. Move engine start switch (6) to the OFF position.
- Remove the tooling. Reconnect hose (14) .
- Disengage prop (12) and lower right engine panel (11). Secure latch (10) .