Table 4-1. Troubleshooting - continued
PROBLEM
POSSIBLE CAUSE
REMEDY
CHAIN FEED DRIVE MOTOR
Motor fails to
1. System leakage - loose
Inspect and tighten port connections
start
connections or broken
and lines.
lines.
2. No fluid - inadequate
Check fluid level in reservoir. Replen-
fluid supply at inlet or
ish as necessary.
in system.
3. System return line or
Check drain filter. Clean and/or re-
drain line restricted.
place filter element.
4. System inlet line re-
Check all strainers and filter for dirt
stricted.
and sludge. Clean if necessary.
5. Fluid viscosity too
Completely drain the system. Add
heavy to pick up prime.
new filtered fluid of proper viscosity.
6. Air in system.
Tighten any loose connections. Bleed
air from highest point in system and
replenish fluid.
7. Drive train damaged.
Check and repair drive train.
8. Pump driven in wrong
Drive direction must be reversed im-
direction.
mediately to prevent seizure.
9. Pump coupling or shaft
Check shaft engagement and damage.
sheared.
Replace the necessary parts.
10. System relief valve
Disassemble and clean the valve with
stuck open.
solvent. Use pressure gauge to adjust
the relief valve.
11. Pump or motor binding.
Remove and disassemble the unit.
Check for correct assembly of parts.
Also check for dirt or metal chips.
Clean the parts thoroughly and re-
place any damaged parts.
Motor not devel-
1. Insufficient pump
Check pump drive speed.
oping sufficient
speed.
speed or torque
2. Insufficient fluid pres-
Check delivery of pump. Make cer-
sure.
tain sufficient hydraulic fluid is avail-
able to the pump.
3. System overload relief
Check pressure and reset relief valve.
valve set too low.
4-16
