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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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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. |
| Machine Test Parameters | ||
|---|---|---|
| Date | Product or Component SN | |
| Measurement Location | Measurement | Actual |
| Minimum hydraulic oil temperature for test | |
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| Test Specifications | ||
|---|---|---|
| Date | Product or Component SN | |
| Test | Measurements | Actual |
| Charge pressure | |
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| Torque for adjustment screw lock nut | |
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Charge pressure is used to move the swashplate in the propel pump and conveyor pump. Charge pressure is also used to release the parking brakes in the propel motors. Charge oil also replenishes oil lost to internal leakage and system flushing in the hydrostatic drive circuits. Charge pressure should be tested if any of the following symptoms are experienced:
- The propel and/or conveyor response is erratic or sluggish.
- The hydraulic oil is overheating.
- The parking brakes are dragging.
- Machine hydraulic power or conveyor power is low.
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| Illustration 1 | g06204647 |
| Required Tools | ||||
|---|---|---|---|---|
| Tool | Item | Qty | Part No | Description |
| A | 198-4240 | Digital Pressure Indicator Gp | ||
| A | A1 | 1 | 198-4234 | Digital Indicator |
| A2 | 1 | 198-4237 | Pressure Sensor Gp
zero to |
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| A3 | 1 | 198-4236 | Adapter Cable As | |
- Connect Tool (A2) to Tool (A3).
- Connect Tool (A3) to Tool (A1).
- Drive the machine to a smooth, horizontal surface.
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Illustration 2 g06228671 - Move propel lever (1) into the maximum position opposite of the direction of travel. The farther the lever is moved, the faster the machine will stop. Release the lever.
- Verify that the parking brake is engaged by checking parking brake indicator (2). The parking brake should activate automatically when the machine is stopped. If the parking brake is not active, use propel lever (1) to stop the machine completely.
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Illustration 3 g06228685 - Ensure that the conveyor system is deactivated. The indicator light next to the button should be off. If the conveyor system is operating, push conveyor drive on/off button (5) to deactivate.
- Ensure that the water spray system is deactivated. The indicator light next to the button should be off. If the water spray system is operating, push water spray button (3) to deactivate.
- Ensure that the vacuum dust control system, if equipped, is deactivated. The indicator light next to the button should be off. If the vacuum dust control system is operating, push vacuum dust control button (4) to deactivate.
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Illustration 4 g06228728 - Ensure that the rotor system is deactivated. Indicator light next to the button should be off. If the rotor system is operating, push rotor button (6) to deactivate.
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Illustration 5 g06228737 - Use conveyor buttons (7) to center the conveyor.
- Use propel lever (1) to center the front tracks.
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Illustration 6 g06228749 - Ensure that the right side plate and the left side plate are in the float mode. The indicator light under each side plate lower buttons (8) and (9) should be on. If either side plate is locked, push the corresponding side plate button.
- Place protective material under the rotor to prevent damage to the rotor bits or the work surface.
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Illustration 7 g06228756 - Observe level indicator (10). If the indicator shows "0" go to Step 14. If the indicator does not show "0", go to Step 13.
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Illustration 8 g06228767 - Use rear leg height switches (11) and (12) to level the rear of the machine. Level indicator (10) will show "0" when the rear of the machine is level.
- Use front leg lower button (14) and rear leg lower button (13) to lower the machine until the rotor tips touch the protective material.
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Illustration 9 g06228773 - Ensure that the engine is operating in low idle. The high idle indicator light should be off. If this indicator is illuminated, press throttle control button (15) to operate the engine in low idle.
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Illustration 10 g06228779 - Move engine start switch (16) to the OFF position.
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Illustration 11 g06228904 - Unhook latch (17). Open right compartment door (18) and install the door prop.
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Illustration 12 g06228909 - Remove cap (20) and connect Tool (A2) to pressure tap (19) on the charge filter.
- Move engine start switch (16) to the START position. Release the switch when the engine starts.
- Use throttle control button (15) to operate the engine in high idle.
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Illustration 13 g06228920 - Monitor hydraulic oil temperature (21) on the operator display. Operate the machine until the oil temperature reaches the test temperature listed in the "Specifications" section.
- Use throttle control button (15) to operate the engine in low idle.
- Read pressure on Tool (A) coming from pressure tap (19) on the charge filter. Refer to "Specifications" for the target pressure.
- Move engine start switch (16) to the OFF position.
- If the pressure recorded in Step 5 is outside the specified range, perform "Adjustment Procedure". If the pressure is inside the specified range, go to the next step.
- Remove Tool (A2) from pressure tap (19) on the charge filter. Install cap (20) on the charge pressure tap.
- Release the prop rod, close right compartment door (18), and secure latch (17).
- Unhook latch (22). Open left compartment door (23) and install the door prop.
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Illustration 15 g06228923 - Hold adjustment screw (25) in place and loosen lock nut (24) on the propel pump.
- If the pressure is too low, turn adjustment screw (25) clockwise. If pressure is too high, turn the adjustment screw counterclockwise.
- Hold adjustment screw (25) in place and tighten lock nut (24) to the torque given in the "Specifications" section.
- Release the prop rod, close left compartment door (23), and secure latch (22).
- Perform the "Test Procedure".
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| Illustration 14 | g06228922 |
