LINES GP-PROPEL 2180377 - Caterpillar

This test will show if the synchronizing solenoid operates correctly. This test will also show if the priority valve operates correctly.
Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine.To prevent possible injury, perform the procedure that follows before testing and adjusting the power train.
For the proper set up procedure, refer to "Testing and Adjusting" section of Systems Operation, Testing and Adjusting, "Machine Preparation for Troubleshooting".Procedure
Lower all the implements to the ground. Turn off the engine.
Block the tractor wheels on each side.
Illustration 1 g00870909
Support the rear of the scraper in order to obtain clearance between the wheel and the ground. Refer to Illustration 1.
Remove the tractor axle shafts. Refer to Disassembly and Assembly, "Axle Shaft - Remove".
Illustration 2 g01034199
Location of pressure taps (1) and (2) (1) Pressure tap for direction clutch (P2) (2) Pressure tap for speed clutch (P1)
Remove plugs from P1 speed clutch pressure tap (2) and (P2) the pressure tap for direction clutch (1), and install Tool (D) .
Connect Tooling (E) to Tool (D) .
Illustration 3 g01034250
Lockup clutch and synchronizing valve (3) Synchronizing solenoid (4) Pressure tap for transmission oil pump
At pressure tap (3), remove the plug and install Tool (C) .
Connect Tooling (E) to Tool (C) .
Illustration 4 g00788572
Location of tractor transmission plug
Remove the plug from the right side of the tractor transmission case in order to gain access to the rotary selector spool.
Install a socket extension in the end of the rotary selector spool. Install a ratchet on the extension.
Turn the tractor key start and disconnect switch ON. Do not start the tractor engine.
Start the scraper engine and run the engine at LOW IDLE rpm.
Move the tractor transmission rotary selector spool to any speed position.
Disconnect the synchronizing solenoid harness from the solenoid.
The pressure at pressure tap (3) must be 690 35 kPa (100 5 psi).
The pressure at pressure taps P1 (2) and P2 (1) must be 0 kPa (0 psi).
Connect the synchronizing solenoid harness to the solenoid.
The pressure at pressure tap (3) must be 2400 kPa (348 psi) minimum.
Run the scraper engine up to HIGH IDLE rpm.
The pressure at pressure tap (3) must be 2724 103 kPa (395 15 psi).
When the test is completed, return the tractor transmission rotary selector spool to NEUTRAL and turn the scraper engine OFF. Next, turn the tractor key start and disconnect switch OFF and remove the test equipment.ProblemThe pressure in Step 15 is too low.
Illustration 5 g01034243
Lockup Clutch and Synchronizing Valve (5) Synchronizing valve (6) Spacers
Table 2
Spacer Chart for Synchronization Valve (1)    
Spacer Part Number    Thickness    Change In Pressure    
5M-7914    
0.25 mm (0.010 inch)    
10 kPa (1.5 psi)    
5M-7915    
0.91 mm (0.036 inch)    
35 kPa (5.1 psi)    
( 1 ) Before an adjustment is made, make sure that the valve spring is not weak or broken.Probable CauseThe setting of synchronizing valve (25) is too low. Add spacers (6). Refer to Table 2.ProblemThe pressure in Step 15 is too