VALVE GP-CONTROL 2525984 - Caterpillar

Table 2
Transmission Speed Clutches That are Engaged In The Transmission
First Speed Forward 2 and 5
Second Speed Forward 2 and 4
Third Speed Forward 2 and 3
Neutral 3
First Speed Reverse 1 and 5
Second Speed Reverse 1 and 4
Third Speed Reverse 1 and 3 Introduction
The following test will determine the pressures that are being delivered to each individual transmission clutch.No. 1 clutch through No. 4 clutch will engage at the relief pressure setting of the transmission 2425 125 kPa (352 18 psi) (main relief valve pressure) at LOW IDLE. The No. 5 clutch will engage at a pressure of 2241 200 kPa (325 29 psi) at LOW IDLE.Required Tools
Illustration 1 g02571852
Tooling (A) 198-4240 Digital Pressure Indicator Gp
Table 3
Required Tools
Tool Item Qty Part No Description
A A 198-4240 Digital Pressure Indicator Gp
A1 1 198-4234 Digital Indicator
A2 1 198-4237 Pressure Sensor Gp
(0 to 3,445 kPa (0 to 500 psi))
A3 1 198-4236 Adapter Cable As Reference: Refer to Tool Operating Manual, NEHS0818, "Using the 198-4240 Digital Pressure Indicator Group" for more information on using Tooling (A).Machine Preparation
Move the machine to a smooth horizontal location.
Place the steering control lever in the NEUTRAL position.
Engage the parking brake.
Lower the attachments to the ground.
Stop the engine.
Illustration 2 g03395826
(1) Bolts
(2) Cover
Remove bolts (1) and remove cover (2) from the machine.
Illustration 3 g02515536
(P8) Pressure Tap (No. 1 Clutch)
(P9) Pressure Tap (No. 2 Clutch)
(P10) Pressure Tap (No. 3 Clutch)
(P11) Pressure Tap (No. 4 Clutch)
(P12) Pressure Tap (No. 5 Clutch)
Attach Tooling (A) to pressure tap (P9) and Tooling (A) to pressure tap (P12). Pressure tap (P9) is for No. 2 Clutch (FORWARD). Pressure tap (P12) is for No. 5 Clutch (FIRST SPEED).
Run the hydraulic hoses from tooling (A) into the cab. Test Procedure
Start the engine. Warm the power train oil to a minimum temperature of 84° 8°C (183° 14°F).
Disengage the park brake. Fully engage the service brake pedal. Note: Keep the service brake pedal fully engaged during the entire test.
Operate the engine at LOW IDLE. Move the machine with the steering control lever in the FIRST SPEED FORWARD position.
Check the pressure at Tooling (A) for the No. 2 clutch. The pressure at Tooling (A) for the No. 2 clutch should be 2650 150 kPa (384 22 psi).
Check the pressure at Tooling (A) for the No. 5 clutch. The pressure at Tooling (A) for the No. 5 clutch should be 2422 275 kPa (351 40 psi).
Use Table 1 in order to check all of the other combination of clutches. Record the pressure measurements in Table 2.