SkyTrak 3606 Service Manual - Manual (Page 315)

Hydraulic System
9-121
22. Steering is “ spongy” or
noisy.
1. Air in steering lines.
2. Faulty steering unit.
1. Check and tighten loose
connections. Operate steering
lock-to-lock several times to
purge air from system.
2. Replace steering unit.
23. Auxiliary equipment oper-
ates slowly or malfunc-
tions.
1. External fluid leakage.
2. Faulty relief valve setting.
3. Internal cylinder leakage.
4. Internal leakage in main or
auxiliary control valve.
5. Insufficient flow of oil.
6. Pilot valve malfunction.
1. Check and tighten connections;
replace defective hoses, etc.
2. Check and set relief valve to
proper specification.
3. Repair cylinder as required.
4. Repair control valve as
required.
5. Check flow and pressure from
pump through entire auxiliary
hydraulic circuit. Repair or
replace parts as required.
6. Check and replace as required.
24. Auxiliary equipment drifts
or creeps.
1. Leakage in auxiliary cylinder. 1. Repair or replace cylinder or
check valve.
25. Pump fails to deliver fluid
to unloader valve.
1. Low hydraulic fluid in reservoir.
2. Hydraulic oil reservoir breather
is dirty.
3. Suction strainer is clogged.
4. Suction line is restricted or
loose.
5. Fluid viscosity is too heavy to
allow pump to be primed.
6. Worn, broken or stuck parts
within pump.
1. Check fluid level and add fluid
as required.
2. Clean or replace the breather.
3. Clean suction strainer.
4. Clean or replace suction line
and/or tighten if loose.
5. Check working temperature and
service as required. Change
fluid to proper viscosity as
required. Refer to Section 2
General Information,
Specifications and
Maintenance.
6. Troubleshoot and correct true
cause of pump failure and
repair or replace pump.
26. Cylinder fails to move
when control valve is actu-
ated.
1. Faulty hose.
2. Insufficient flow of oil.
3. Damaged cylinder.
4. Defective control valve.
5. Pilot selector malfunction.
6. Pilot valve malfunction.
1. Repair or replace hose.
2. Check hydraulic pump.
3. Repair or replace cylinder.
4. Inspect and repair as required.
5. Check and replace as required.
6. Check and replace as required.
Hydraulic System Troubleshooting
Problem Cause Remedy
Model 3606 • Origin 10/99