PISTON 8E5831 - Caterpillar

Table 1
Tools Needed    
Part Number     Description     Quantity    
3B-7282     Pipe Nipple     1    
9U-7400     Multitach Tool Group     1    
6V-4142     Unvalved Nipple     1    
1U-5481     Pressure Gauge Group     1    
1U-5482     Pressure Adapter Group     1    
6V-6064     Transmission Test Cover     1    
FT-1775     Transmission Test Cover     1    
8T-0855     Pressure Gauge     5    
8T-0854     Pressure Gauge     6    This test will determine if the operation of the priority reduction valve for the selector group is correct. This test will determine if the setting of the priority reduction valve for the selector group is correct. Procedure
Illustration 1 g00635977
Pressure Control Group (M) Pressure tap for pilot oilNote: When you are using a FT-1775 Transmission Test Cover in order to complete the maximum clutch pressure test, perform Step 1 through Step 7 and proceed to the next test. When you are using a FT-1775 Transmission Test Cover in order to complete the maximum primary clutch pressure test, perform Step 1 through Step 7 and proceed to the next test. Pilot pressure can be checked while the clutch pressures are checked.
Disconnect the wiring harness from both the downshift solenoid and the upshift solenoid.
Remove the solenoid guard and the large cover from the transmission case.
Remove the plug from pressure tap (M) .
Install a 3B-6552 Elbow in pressure tap (M). Connect a 3B-7282 Pipe Nipple with a 6V-4142 Unvalved Nipple to the elbow.
Replace the large cover on top of the transmission case. In order to prevent the release of oil, use a piece of plastic or paper with the cover. In order to keep dirt out, use a piece of plastic or paper with the cover.Note: This step is used as an alternate step for Step 5.
Install the FT-1775 Transmission Test Cover in place of the large cover. Use four bolts that are evenly spaced.
Connect a 8T-0855 Pressure Gauge to 6V-4142 Unvalved Nipple .
Engage the parking brakes. Start and operate the engine at LOW IDLE rpm with the transmission in NEUTRAL.
The pressure on the gauge should be between 1725 70 kPa (250 10 psi).
When the test is complete, stop the engine.Results
Illustration 2 g00635979
Selector Group (1) Neutralizer valve (2) Spacers (3) Priority reduction valve (M) Pressure tap for pilot oil
Table 2
Spacer Chart    
Part Numbers for Spacers (2)     Thickness     Change in Pressure    
5M-3492    
0.25 mm (.010 inch)    
17 kPa (2 psi)    
7M-1397    
0.91 mm (.036 inch)    
60 kPa (9 psi)    Note: Before adjustment is made, make sure that the valve spring is not weak or broken.
If the pressure on the gauge is too low, the setting of priority reduction valve (3) is too low. Add spacers (2) and refer to Table 2.
If the pressure on the gauge is too high, the setting of priority reduction valve (3) is too high. Remove spacers (2) and refer to