SkyTrak 3606 Service Manual - Manual (Page 313)

Hydraulic System
9-119
10. Frame tilt slow or malfunc-
tioning.
1. External fluid leakage at tubes,
hoses or fittings.
2. Faulty relief valve setting.
3. Internal leakage in cylinders.
4. Internal leakage in main control
valve.
5. Defective hydraulic pump.
6. Malfunctioning pilot valve.
7. Malfunctioning unloader valve.
1. Check and tighten connections.
Repair or replace faulty hose(s).
2. Adjust pressure to proper
setting or replace valve.
3. Repair cylinders as required.
4. Repair control valve as
required.
5. Repair pump.
6. Check and replace as required.
7. Check and replace as required.
11. Frame tilt drifts. 1. Defective check valves or frame
tilt cylinder.
1. Repair or replace check valves
or frame tilt cylinder.
12. Service brakes grab. 1. Excessive hydraulic pressure. 1. Adjust pressure reducing valve.
13. Service brakes spongy. 1. Air in brake line.
2. Insufficient hydraulic pressure.
1. Bleed brake lines.
2. Check and/or adjust pressure
reducing valve.
14. Service brakes fail to
release.
1. Brake pedal binding.
2. Faulty brake valve.
1. Correct condition.
2. Replace brake valve.
15. Service brake failure. 1. Ruptured hydraulic hose.
2. Faulty brake valve.
3. Pressure reducing valve failure.
4. Insufficient pressure at auxiliary
function manifold.
5. Defective brake discs or leakage
within brake section of axle.
1. Replace hose.
2. Replace brake valve.
3. Replace pressure reducing
valve.
4. Adjust pressure at auxiliary
function manifold or replace
pressure reducing valve
cartridge.
5. Check manufacturer’s
information and specifications
(refer to Section 5 Axles,
Wheels and Tires).
16. Park lock brake fails to
release.
1. Ruptured hydraulic hose.
2. Defective park lock switch.
3. Park lock solenoid valves fail to
shift.
4. Defective park lock assembly in
front axle.
1. Replace hose.
2. Replace park lock switch.
3. Check for proper operation of
solenoids or valves. Check
electrical schematic (Section
10) and test electrical circuit.
4. Repair park lock per
manufacturer’s information and
specifications (refer to Section 5
Axles, Wheels and Tires).
Hydraulic System Troubleshooting
Problem Cause Remedy
Model 3606 • Origin 10/99