Operation and maintenance manual

Section 120-0010
Transmission - Transmission and Mounting
SM 2124 Rev 3 8-03
2
SM - 1843
SWITCHES AND SENSORS
Numbers in parentheses refer to Fig. 2, unless
otherwise specified.
Transmission Oil Temperature
Oil temperature sender (9) sends a signal to indicate
transmission oil temperature on the transmission oil
temperature gauge. The gauge should read in the
green zone during normal operation and may read in
the yellow zone during retarder operation. If the
needle remains in the red zone for extended periods,
the machine should be brought to a stop,
transmission shifted to neutral and engine speed
increased to 1 200 - 1 500 rev/min. Under this
condition, oil temperature should drop to normal
values in about 2 - 3 minutes. If oil temperature does
not drop, the cause should be investigated.
The transmission oil temperature is monitored by
temperature sensors in the main control valve, which
sends a signal to illuminate the transmission STOP
warning light. The light will illuminate to indicate any
of the following conditions:
High retarder temperature
High transmission sump temperature
Engine overspeed
If the light illuminates during normal operation, a fault
code will also register on the display unit (See EST-37
Trouble Shooting tables). Bring the machine to a stop
and investigate the cause.
4
1
K2 KR KV K4 K3
K1
Y
9
11
10
2
4
5
6
3
VIEWED FROM THE REAR
DETAIL Y
8
7
Fig. 2 - Location of Transmission Switches, Sensors and Solenoids
1 - Retarder Oil Temperature Sensor
2 - Main Control Valve
3 - Difflock Warning Light Switch
4 - Lockup Solenoid
5 - Engine Speed Sensor
6 - Output Speed Sensor
7 - Central Gear Train Sensor
8 - Turbine Speed Sensor
9 - Oil Temperature Sender (Gauge)
10 - Breather
11 - Emergency Steering Low Pressure Switch
KV, KR, K1 to K4 - Supply ports to
Multi-disc Clutches