SOCKET-105 MM 4C4474 - Caterpillar

Fully apply parking brake and service brake. Select manual shift mode. Shift transmission to FOURTH SPEED, NEUTRAL.
Shift the transmission to FOURTH SPEED, FORWARD, and press throttle pedal to 100%.
A warning indicating that the machine is in gear with parking brake applied will appear on the display.
Once the engine speed stabilizes, record engine speed.
Shift the transmission to FOURTH SPEED, NEUTRAL, and release throttle pedal.
Table 9
Stall Speed
Stall speed for the 980M Stall speed for the 982M
Economy Mode Off
1973 +10/ -50 rpm Economy Mode Off
1847 +10/- 50 rpm If the torque converter stall speed is too high, the engine power output could be too high. (Not likely)If the torque converter stall speed is too low, the engine may not be developing full power. There may be a parasitic load on the engine.Test Procedure for Torque Convertor Double Stall
Run the engine and warm the machine to operation temperatures. Engine coolant and hydraulic oil should be at normal machine testing temperatures.Note: Warm transmission oil and torque converter oil to the temperatures listed in table.
Table 10
Oil at Normal Operating Temperature
Transmission Oil Torque Converter Oil
83° 7°C (181° 12°F) 93° 17°C (199° 30°F)
Fully apply parking brake and service brake. Select manual shift mode. Shift transmission to FOURTH SPEED, NEUTRAL.
At low idle shift the transmission to FOURTH SPEED, FORWARD.
Fully place the bucket in the racked back position.
Place engine in HIGH IDLE.
Stall tilt fully in the racked back position, and command full lift.
Once the engine speed stabilizes, Record the stabilized engine speed that occurs when the lift cylinders are extending.
Shift the transmission to FOURTH SPEED, NEUTRAL, and release throttle pedal.
Table 11
Double Stall Speed
Stall speed for the 980M Stall speed for the 982M
Economy Mode Off
1435 +150/- 100 rpm Economy Mode Off
1405 +150/- 100 rpm If the torque converter double stall speed is too high, the engine power output could be too high. (Not likely)If the torque converter double stall speed is too low, the engine may not be developing full power. There may be a parasitic load on the engine.Transmission Oil Pump Pressure
Illustration 9 g03672329
Electronic Main Relief Valve (eMRV) is located on the left side of torque converter housing.
(17) Electronic Main Relief Valve (eMRV)
The electronic main relief valve (eMRV) is what controls the "pump pressure". The machine uses an electronically controlled (eMRV) which is controlled by the transmission ECM. The pump pressure, which is controlled by the (eMVR), will automatically increase if the transmission software detects that the pressure is too low.If the measured pump pressures do not meet specification, temporarily replace the (eMRV) and repeat the test through Cat ET. If the measured pump pressures are still NOT within specification after replacing the (eMRV), the transmission pump may need checked.Test for the Transmission Oil Pump Pressure
Before checking the Transmission Oil pump Pressure, verify the transmission neutral clutch solenoid modulating valve is functioning.Reference: Refer to the section "Test for the Transmission Clutch Solenoid Modulating Valve" in this document for the proper procedure.Also, verify the pressure difference between the transmission pump and the transmission neutral clutch