SkyTrak 3606 Service Manual - Manual (Page 312)

Section 9
9-118
6. Boom hoist or extend
function 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. Control valve not fully shifted.
6. Defective hydraulic pump.
7. Malfunctioning pilot valve.
8. Malfunctioning unloader valve.
1. Check and tighten connections.
Repair or replace faulty hose(s).
2. Adjust pressure to proper
setting.
3. Repair cylinders as required.
4. Repair control valve as
required.
5. Repair control circuit.
6. Repair pump.
7. Check and replace as required.
8. Check and replace as required.
7. Boom hoist or extend
function drifts.
1. Defective counterbalance valve
or cylinder seals.
2. External fluid leakage at tubes,
hoses or fittings.
3. Faulty relief valve setting.
4. Internal leakage in cylinders.
5. Internal leakage in main control
valve.
6. Defective hydraulic pump.
1. Repair or replace
counterbalance valve or seals
as required.
2. Check and tighten connections.
Repair or replace faulty hose(s).
3. Adjust pressure to proper
setting.
4. Repair cylinders as required.
5. Repair control valve as
required.
6. Repair pump.
8. Attachment tilt slow or
malfunctioning.
1. Defective counterbalance valve
or seals.
2. External fluid leakage at tubes,
hoses or fittings.
3. Faulty relief valve setting.
4. Internal leakage in cylinders.
5. Internal leakage in main control
valve.
6. Defective hydraulic pump.
7. Malfunctioning pilot valve.
8. Malfunctioning unloader valve.
1. Repair or replace
counterbalance valve or seals
as required.
2. Check and tighten connections.
Repair or replace faulty hose(s).
3. Adjust pressure to proper
setting or replace valve.
4. Repair cylinders as required.
5. Repair control valve as
required.
6. Repair pump.
7. Check and replace as required.
8. Check and replace as required.
9. Attachment tilt drifts. 1. Defective attachment tilt or slave
cylinder(s).
2. Defective counterbalance valves.
1. Repair or replace cylinder.
2. Repair or replace
counterbalance valves.
Hydraulic System Troubleshooting
Problem Cause Remedy
Model 3606 • Origin 10/99