Engine/Machine Troubleshooting - Terex ASV SR70 Service & Repair Manual

Problem 9:
Lift arm control joystick will not lock into float
position.
Possible causes
1. Float magnet fuse blown.
2. Loose, broken, or disconnected wiring at fuse, float
detent magnet, or pin connector P8.
3. Faulty float detent magnet.
Problem 10:
Lift arms will not float, engine labors and lift arms
create down pressure when float is engaged.
Possible causes
1. Engine RPM too low.
2. Low charge pressure.
3. Lift arm control joystick malfunction (pilot control).
4. Lift arm control valve malfunctioning.
Problem 11:
Hydraulic oil temperature elevated; hydraulic sys-
tem overheating.
Possible causes
1. Debris plugging oil cooler, limiting airflow.
2. Low hydraulic oil level.
3. Loose or missing fan belt.
4. Damaged or missing cooling fan blades.
5. Incompatible attachment.
a) Attachment must match machine flow capabili
ties.
b) Attachment hose inside diameter must be at
least ½" for low flow and ¾" for high flow.
c) Low flow attachment coupled to high flow circuit.
6. Faulty hydraulic oil temperature sending unit.
7. Faulty quick coupler.
8. Cooler bypass relief open.
Note: Cooler bypass should open at 80 PSI.
Problem 12:
Engine coolant temperature elevated; engine over-
heating.
Possible causes:
1. Low coolant level.
2. Debris plugging radiator, limiting airflow.
3. Damaged or missing cooling fan blades.
4. Loose or missing fan belt.
5. Faulty engine coolant temperature gauge.

Engine/Machine Troubleshooting

When a problem occurs that effects engine perform-
ance or function, it is important to determine whether
or not the problem lies with the machine itself, or with
the engine. A machine problem should be repaired by
an ASV dealer, while an engine specific problem
should only be repaired by a representative of the
engine manufacturer. Making this determination will
ensure timely and appropriate service to help minimize
down-time.
Problem:
Hard starting
check for:
1. 12V power to glow plugs. (With test light or multi-
meter, measure voltage at green glow plug com-
mon power lead.)
a) If power is not present, see problem 1, step 7.
2. Water in fuel.
3. Proper grade and quality fuel.
Problem:
Low power
check for:
1. Dirty, clogged, or restricted fuel filter.
2. Adequate supply of fuel to engine (fuel lines).
3. Water in fuel.
4. Proper grade and quality fuel.
Problem:
No start
check for:
1. 12V power at fuel shutoff solenoid. (With test light
or multi-meter, measure voltage at white power
lead entering the solenoid.)
a) If no power is present, see problem 1, step 3-6)
2. Ensure 12V power to fuel pump. (With test light or
multi-meter, measure voltage at white power lead
entering the electronic fuel pump.)
3. Low fuel.
4. Out of fuel. (ensure proper gauge/sending unit
function. Inspect tank for fuel)
5. Blocked or restricted fuel line. (try alternate/remote
fuel supply to pump.)
6. Water in fuel.
7. Proper grade and quality fuel.
If any of the above conditions are present, the problem
lies with the machine and should be serviced by an
ASV dealer. If the conditions listed above are not pres-
ent, the problem lies with the engine and it should be
serviced by a Perkins engine repair facility to comply
with the conditions of the engine warranty.
18-3
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Rubber Track Loader
18. Troubleshooting