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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 |
| Pressure reducing valve setting | |
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A pressure reducing valve controls the maximum pressure available to extend and retract the screed. The following procedure tests the setting of this valve. The procedure also describes how to adjust the pressure reducing valve.
Perform this procedure if the hydraulic system has insufficient power to extend and/or retract the screed.
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| Illustration 1 | g02571852 |
| Required Tools | ||||
|---|---|---|---|---|
| Tool | Item | Qty | Part No | Description |
| A | 198-4240 | Digital Pressure Indicator Gp | ||
| A1 | 1 | 198-4234 | Digital Indicator | |
| A2 | 1 | 198-4238 | Pressure Sensor GpZero to |
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| A3 | 1 | 198-4236 | Adapter Cable As | |
- Connect Tool (A2) to each Tool (A3).
- Connect Tool (A3) to Tool (A1).
| Required Tools | ||||
|---|---|---|---|---|
| Tool | Item | Qty | Part No | Description |
| B | B1 | 1 | 7X-0871 | Tee |
| B2 | 1 | 6V-8398 | O-Ring Seal | |
| C | C1 | 1 | 6V-3965 | Fitting |
| C2 | 1 | 6V-8397 | O-Ring Seal | |
Install Tool (C) on Tool (B).
- Drive the machine to a smooth, horizontal surface.
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Illustration 2 g03890163 - Move propel lever (4) to the NEUTRAL position.
- Press parking brake switch (5) to change the status of the parking brake to "engaged". When the parking brake status is "engaged", an LED next to the parking brake switch will be illuminated.
- Use travel mode switch (3) to select the pave mode. When the travel mode is set to pave, an LED next to pave symbol (2) will be illuminated.
Note: The machine must be in pave mode to operate the screed lift system, hopper system, tow point system, and auger lift system.
- Press and hold screed raise switch (1). Release the switch when the screed is raised fully.
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Illustration 3 g03890192 - Engage screed lock lever (6) on each side of the machine.
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Illustration 4 g03890385 - Use screed float switch (7) to place the screed in the FLOAT position. When the screed is in the FLOAT position, an LED next to the screed float switch will illuminate. Allow the tow arms to rest on the screed lock mechanisms.
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Illustration 5 g06004044 - Press left screed extend switch (8). Release the switch when the left screed extender is fully extended.
- Press right screed extend switch (9). Release the switch when the right screed extender is fully extended.
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Illustration 6 g06004050 - Press rpm decrease switch (10) once to operate the engine in low idle.
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Illustration 7 g06004080 - Examine the display. If "Regen Conditions Not Met" warning (11) is shown and the banner is yellow, allow the engine to operate until the regeneration cycle is complete. The cycle may require up to 1 hour to complete. If the warning banner is red, use Cat® ET to complete a regeneration cycle as soon as possible. If no engine regeneration warning is shown, go to the next step.
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Illustration 8 g06004087 - Press and hold push to start switch (12). Release the switch when the engine stops.
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Illustration 9 g06004094 - Move machine power switch (13) to the OFF position.
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Illustration 10 g06004711 - Lift rear screed deck plate (14), and install the prop rod.
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Illustration 11 g06004718 - Disconnect hose (15) from port "A1".
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Illustration 12 g06004729 - Install Tool (B) in port "A1".
- Connect hose (15) to Tool (B).
- Connect Tool (A2) to Tool (C).
- Move machine power switch (13) into the ON position. After the home screen is shown on display (16) press and hold push to start switch (12). Release the switch when the engine starts.
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Illustration 14 g06004744 - Actuate screen unlock switch (17) to enable the touch screen on the display.
Note: When the display is enabled, an LED next to the screen unlock switch is illuminated.
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Illustration 15 g06004758 - Tap status icon (18) to enter the status screen.
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Illustration 16 g06004764 - Operate the engine at low idle for a few minutes. Press rpm increase switch (19) once to operate the engine in high idle.
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Illustration 17 g06004770 - Monitor hydraulic oil temperature (20) on display (16). Operate the machine until the oil temperature reaches a minimum of
45 ± 10 °C (113 ± 18 °F) . - Press and hold left screed extend switch (8). Read pressure on Tool (A1). Refer to the Test Specifications table for the correct pressure.
- Press rpm decrease switch (10) once to operate the engine in low idle.
Note: If necessary. perform a regeneration cycle before the engine is stopped.
- Press and hold push to start switch (12). Release the switch when the engine stops.
- Move machine power switch (13) to the OFF position.
- If the pressure is inside the specified range, go to the next step. If the pressure is outside the specified range, go to "Adjustment Procedure".
- Disconnect Tool (A1) from Tool (C).
- Disconnect hose (15) from Tool (B).
- Remove Tool (B) from port "A1".
- Connect hose (15) to port "A1".
- Remove the prop rod, and lower rear screed deck plate (14).
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| Illustration 13 | g06004737 |
- Loosen locknut (21). Turn adjustment screw (22) clockwise to increase pressure. Turn the adjustment screw counterclockwise to decrease pressure.
- Hold adjustment screw (22). Tighten locknut (21).
- Perform the test procedure.
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| Illustration 18 | g06004778 |