Operation and maintenance manual

Section 120-0010
Transmission - Transmission and Mounting
SM 2124 Rev 3 8-03
24
3. Disconnect the following cables and connectors in
the order given, to prevent serious damage to the
vehicles electrical components.
a - Battery earth cables
b - Battery supply cables
c - Alternator earth cables
d - Alternator supply cables
e - Body hydraulics joystick
f - Transmission (Est-37) connector
g - ECM interface harness connector (30 pin RHS)
h - ECM power harness connector (5 pin RHS)
i - ECM sensor harness connector (30 pin LHS)
j - ECM engine to transmission datalink connector
(6 pin RHS)
4. Carefully loosen brake pipes at base of both
accumulators to check that brake pressure has been
discharged. Tighten brake pipes.
5. Remove blanking cap from remote drain line at the
bottom of the hydraulic tank. Install a length of hose
on remote drain fitting, open drain cock and drain
hydraulic oil into a suitable container. Close drain
cock, remove hose and reinstall blanking cap.
6. Disconnect transmission harness at the cab floor
and earth strap between rear LH side of the
transmission and the frame.
7. Remove cab from the machine. Refer to Section
260-0010, CAB AND MOUNTING.
8. Disconnect all drivelines connected to the
transmission and secure clear of the transmission.
Refer to Section 130-0010, DRIVELINES.
9. Remove both exhaust tubes above transmission.
10. Disconnect all electrical harnesses and
connections not previously disconnected on removal of
the cab assembly.
11. Identify and tag all hydraulic lines at the main
hydraulic, brake and emergency steering pumps.
Disconnect hydraulic lines and cap lines and ports to
prevent entry of dirt.
Note: The transmission can be removed from the
vehicle without removing any of the pumps.
transmission oil temperature reaches 140° C (284° F). The
retarder will automatically disengage when the oil
temperature reaches 150° C (302° F) irrespective of
engine speed. The speed must be reduced by using the
service brakes so that the oil is cooled down. Reduce
downgrade travel speed to avoid the oil overheating and
possible damage to the transmission.
If the vehicle is approaching an overspeed condition,
the transmission performs an upshift at an engine
speed of 2 500 rev/min to the next highest gear to
decrease the engine speed, whether in manual or
automatic mode. If 6th gear is already selected, the
retarder is automatically engaged at 2600 rev/min to
decrease the engine speed irrespective of the
accelerator position. The retarder is disengaged at
2450 rev/min. A fault code will be displayed and
recorded by the TCU. If the oil temperature reaches
150° C (302° F) the retarder is disengaged and a fault
code will be displayed and recorded by the TCU.
REMOVAL
Numbers in parentheses refer to Fig. 1.
Note: Tag all lines, cables and linkages disconnected
during removal to aid in installation.
WARNINGS
To prevent personal injury and property damage,
be sure wheel blocks, blocking materials and
lifting equipment are properly secured and of
adequate capacity to do the job safely.
Hydraulic oil pressure will remain within
the braking system after engine shutdown.
Operate the treadle valve continuously until
the pressure has dissipated before removing
any brake lines or serious injury could result.
High electrical current can cause sparks
and personal injury from burns. Turn battery
master switch to the 'Off' position before
disconnecting any components.
1. Position the vehicle in a level work area, ensure the
body is fully lowered, apply the parking brake and switch
off the engine. Operate steering right and left several
times to relieve any pressure in the steering system.
2. Operate the treadle valve continuously to discharge the
brake accumulators, block all road wheels, place the
steering lock bar in the 'Locked' position and the battery
master switch in the 'Off' position.