Terex ASV SR70 Service & Repair Manual page 135

Rubber Track Loader
18. Troubleshooting
Problem 2:
Machine cranks, but will not start.
Possible causes
1. Fuel tank empty, fuel filter plugged or fuel line
restricted.
2. Battery discharged (engine rotates slowly).
3. Injection pump fuse blown.
4. Power relay (B) fuse blown (40 amp).
5. Faulty power relay (B).
6. Loose, broken or disconnected wiring at injection
pump, fuel pump or fuse.
7. Glow plugs not pre-heating (look for black smoke).
a) Main glow plug fuse blown.
b) Glow plug relay malfunctioning.
c) Loose, broken, or disconnected wiring at ignition
switch, relay or glow plug ground strip.
d) Faulty glow plugs.
8. Faulty ignition switch.
9. Loose, broken or disconnected wiring in starting cir-
cuit.
10.Loose, broken or disconnected wiring at fuel shutoff
solenoid.
11. Air in fuel system or defective fuel injection pump.
Problem 3:
Machine starts, but hydraulics will not operate.
Possible causes
1. Operator not in seat.
2. Seat belt not fastened.
3. Safety relay fuse and or or safety solenoid fuse for
seat belt or operator presence safety switches
blown.
4. Faulty operator presence safety switch.
a) Test for continuity through operator presence
and seat belt switches. Adjust or replace as neces-
sary.
5. Loose, broken or disconnected ground wires (check
ground connections behind the operator seat, from
cab to chassis and on the chassis crossmember.)
6. Faulty safety relay.
7. Faulty safety solenoid or safety solenoid spool.
8. Loose, broken or disconnected wiring at fuse, relay,
or safety solenoid.
9. Low charge pressure.
Problem 4:
Lift arm/bucket controls are operational, but tracks
will not move.
Possible causes
1. Leak in feed line to drive control joystick (pilot con-
trol).
2. Loose, broken or disconnected wire to DA control
solenoid.
3. Drive control joystick (pilot control) malfunction.
4. Low charge pressure.
5. Parking brake switch in on position.
6. Faulty parking brake switch.
Problem 5:
Tracks are operational, but lift arms will not move.
Possible causes
1. Continuous hydraulic flow switch activated, sending
oil over relief. (lift arms work, but move slowly)
If auxiliary flow hydraulics work check for:
a) Leak in feed line to lift arm control joystick (pilot
b) Lift arm control joystick (pilot control) malfunc
c) Lift arm control valve assembly malfunction.
If auxiliary flow hydraulics do not work check for:
a) Main auxiliary relief malfunction.
b) Faulty auxiliary pump.
Problem 6:
Lift arms are operational, but high/low flow auxil-
iary circuits are not.
Possible causes
1. Auxiliary hydraulic fuse blown.
2. Faulty ground in at chassis crossmember.
3. Faulty auxiliary hydraulic switch.
4. Faulty auxiliary hydraulic solenoid at pilot genera-
tion block.
5. Loose, broken or disconnected wire at fuse, auxil-
iary hydraulic switch, pin connector P10.
6. Auxiliary hydraulic pilot generation spool stuck in
closed position.
7. Faulty or improperly connected quick coupler.
8. Quick coupler block pressure release stuck in down
(open) position.
Problem 7:
Multiple switches/electrical accessories are not
operational in ON or RUN position.
Possible causes
1. Power A or B fuse blown.
2. Faulty power relay (A or B).
3. Faulty ignition switch.
4. Loose, broken or disconnected wiring at ignition
switch, fuse or relay.
Problem 8:
Battery will not charge/maintain charge.
Possible causes:
1. Loose alternator belt.
2. Alternator fuse blown.
3. Faulty alternator diode.
4. Loose, broken or disconnected wiring at battery,
alternator, diode or fuse.
5. Excessive current draw with key in "off" position.
6. Faulty battery.
7. Faulty alternator.
18-2
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