Maintenance - Manitowoc Grove TMS800E Service And Maintenance Manual

HYDRAULIC SYSTEM

Maintenance

Troubleshooting
Symptom
1. No hydraulic oil
flows in systems.
2. Slow response.
3. Pump noise
accompanied by
hydraulic oil
foaming in
reservoir.
4. Excessive
pressure buildup.
5. Specific hydraulic
system (lift, hoist,
telescope, swing)
not working.
2-10
Probable Cause
a. Low hydraulic oil level.
b. Reservoir-to-pump
broken or restricted. Air entering at
suction lines. Pump not priming.
c. Pump shaft sheared or disengaged.
d. Internal contamination.
a. Low hydraulic oil level.
b. Hydraulic oil temperature too high
(watery thin oil) or too low (thick
sluggish oil).
c. Faulty pump section(s).
a. Low hydraulic oil level.
b. Excessive engine speed.
c. Air entering at suction lines.
a. System relief valve set too high.
b. Restricted pump-to-control
valve supply line.
a. Leak in system.
b. Faulty electric controls/signals.
c. Faulty directional control valve.
d. Poorly adjusted control in circuit.
e. Faulty hydraulic cylinder, motor, or
valve.
Published 01-29-2014, Control # 496-00
a.
suction lines b. Clean, repair, or replace lines as
c.
d. Drain, flush with recommended oil
a.
b. If too low, warm up system. As
c.
a.
b. Regulate engine speed.
c.
a.
b. Clean, repair, or replace line as
a.
b. Adjust or replace controls/signals.
c.
d. Troubleshoot circuit with schematic.
e.
TMS800E SERVICE MANUAL
Solution
Check system for leaks. Make repairs
as needed. Fill reservoir.
necessary. Check lines for security,
a b s e n c e o f c r a c k s , a n d p r o p e r
a t ta c h m e n t . Ti g h t e n , r e pa i r, o r
replace parts as necessary.
If drive shaft is damaged or sheared,
remove and repair or replace as
necessary
mixture, then drain and refill system
with recommended hydraulic oil.
Check system for leaks. Make repairs
as needed. Fill reservoir.
needed, troubleshoot cooler circuit. If
too high, troubleshoot cooler circuit.
Likely suspects are in-line check
valve and related hydraulic circuits.
Repair or replace pump section(s) or
entire pump.
Check system for leaks. Make repairs
as needed. Fill reservoir.
Check all lines for security and proper
repair. Tighten, repair, or replace as
needed.
Using adequate pressure gauge,
a d j u s t s y s t e m r e l i e f v a l v e a s
necessary.
necessary.
Repair leak.
Replace valve.
Adjust hydraulic component per
schematic.
Replace faulty component.