Published 08-25-09, Control # 077-04 7-1
RT9130E SERVICE MANUAL POWER TRAIN
SECTION 7
POWER TRAIN
DESCRIPTION
The engine is a Cummins QSC diesel engine (Figure 7-1).
This Service Manual does not include detailed information
on the engine itself. A separate manual as prepared in detail
by the engine manufacturer, is supplied with this Service
Manual. However, a short description and maintenance of
certain components of the fuel system, air intake system,
and water cooling system is provided in this section.
The engine is electronically controlled by the Electronic
Control Module (ECM), it is the control center of the system.
It processes all of the inputs and sends commands to the fuel
systems as well as vehicle and engine control devices.
Engine speed is controlled by the foot throttle pedal in the
cab. It controls engine RPM which increases or decreases
proportionately with the amount of foot pressure applied to
the pedal. Engine speed is also controlled by a hand
controlled knob located to the right of the ignition switch. A
rocker switch located beside the ignition switch is used to
choose between HAND or FOOT control. An increase in
engine rpm occurs when the hand throttle is turned
clockwise. A decrease in engine rpm occurs when the hand
throttle is turned counter clockwise. The foot throttle pedal
and hand throttle control knob are electrically connected to
the superstructure control module which sends the signal to
the engine ECM via the J1939 data link.
The engine and its components are enclosed in a hood
assembly with a grill in the rear of the hood for adequate air
circulation. Access to the engine is gained through a door
assembly in the top of the hood that opens from both sides.
The air intake filter is mounted on the front of the left rear
fender. The muffler is mounted on the left side of the frame
behind the left rear fender.
The engine is equipped with electric air heating elements
that are located in the engine’s intake air stream to aid in cold
starting and reduce white smoke at start-up. In the preheat
mode, the engine should not be cranked until the WAIT-TO-
START lamp turns off. The WAIT-TO-START lamp is
illuminated during the preheat time that takes place when the
ignition switch is in the ON position during cold weather
starting. The ECM checks intake manifold temperature to
determine how long to energize the air heater before
extinguishing the WAIT-TO-START lamp. Once the engine is
started, the electric air heating element will be energized
again for a time period determined by intake air temperature.
MAINTENANCE
Engine Removal
1. Set the outriggers and position the boom to over the
side.
2. Open the hood top door assembly.
3. Disconnect the air filter tubing at the engine and air
cleaner (Figure 7-4). Remove and lay aside.
4. Disconnect the exhaust tubing at the engine and muffler.
Remove and lay aside.
5. Tag and disconnect the hourmeter wiring, the engine
electrical harness connector from the carrier harness
connector, the starter and grid heater relay harness from
the carrier harness and the battery cables from the
batteries and the engine.
6. Tag and disconnect the left and right rear backup lights,
stop lights and the backup alarm from the carrier
harness. Take off the clamps holding the harness to the
engine hood.
7. Remove the capscrews and washers securing the
remote secondary fuel filter and mounting bracket to the
engine hood. Tie strap the filter and bracket to the
engine so it is out of the way for removal of the engine.
8. Remove the engine hood assembly and pump cover
from the machine.
9. Drain the engine coolant system into a suitable
container.
10. Drain the engine lubrication system into a suitable
container.
11. Drain the transmission/torque converter oil system into a
suitable container.
12. Tag and disconnect the oil lines from the torque
converter. Cap or plug all openings.
13. Remove the driveline between the torque converter and
the transmission. Refer to DRIVE LINES in this section.
DANGER
Do not spray starting fluid into the air inlet. The spray will
contact the heater elements and could explode causing
personal injury.
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