SkyTrak 3606 Service Manual - Manual (Page 314)

Section 9
9-120
17. Park lock brake fails to set. 1. Defective solenoids and/or
valves.
2. Defective switch.
3. Defective or weak springs in
park lock assembly of front axle.
1. Refer to the appropriate
electrical schematic in Section
10 Electrical System. Check
and/or replace solenoids and
valves.
2. Check electrical schematic
(Section 10) and test electrical
circuit and switch. Repair wiring
or replace switch as required.
3. Repair park lock assembly per
manufacturer’s information and
specifications (refer to Section 5
Axles, Wheels and Tires).
18. Power steering fails com-
pletely.
1. Ruptured hydraulic hose.
2. Faulty steering unit.
3. Insufficient (low) hydraulic
pressure.
4. Unloader valve malfunction.
1. Replace hose.
2. Replace steering unit.
3. Troubleshoot and correct cause
of low pressure. Adjust steering
relief valve.
4. Check and replace as required.
19. No four-wheel or crab
steering, or steering mode
change does not occur.
1. Defective solenoid in steer select
valve.
2. Faulty steer select switch or
wiring.
3. Broken spring in steer select
valve.
1. Repair steer select valve.
2. Repair or replace steer select
switch or wiring.
3. Replace steer select valve.
20. Steering slow or sluggish. 1. Steer relief valve not set
correctly.
2. Defective steer relief valve.
3. Steering cylinder leakage.
4. Unloader valve malfunction.
1. Check and set relief valve to
proper specification.
2. Install new cartridge or replace
valve.
3. Repair or replace steering
cylinder. Refer to
manufacturer’s information and
specifications (see Section 5
Axles, Wheels and Tires).
4. Check and replace as required.
21. Front or rear wheels not
parallel in two-wheel or
four-wheel steering mode.
1. Wheels not properly indexed.
2. Wheel misalignment.
3. Internal steering unit leakage.
4. Defective steer select valve.
1. Index wheels per procedure in
Owners/Operators Manual.
2. Check and adjust wheels
properly per manufacturer’s
information and specifications
(see Section 5 Axles, Wheels
and Tires).
3. Replace steering unit.
4. Check and repair or replace
steer select valve.
Hydraulic System Troubleshooting
Problem Cause Remedy
Model 3606 • Origin 10/99