Stanley MSD 1000 Safety, Operation & Maintenance Manual page 111

MSD SABER SERIES SHEARS
ROTATION CIRCUIT TROUBLESHOOTING GUIDE
continued
SYMPTOM
2. Rotation is excessively
slow, continued
3. Rotation speed exces-
sively high
4. Rotation erratic
5. Rotation drifts
Page 6 Section 7 Troubleshooting
PROBABLE CAUSE
d. Internal leakage in manifold block on
motor
e. Motor is worn out
f. Supply pressure too low
g. Supply fl ow too low
h. Internal leakage in valve
i. Valve supplying hydraulic fl uid is not
working
a. Operating fl ow too high
b. Supply fl ow too high
a. Crossover relieve valve cartridge is
faulty
b. Flow control valve cartridge is faulty
c. Valve spool sticking in valve supplying
oil
d. Faulty electrical signal at control valve
(if electrically controlled)
e. Planetary gearbox binding
f. Motor binding in planetary gearbox
g. Fault circuit relief valve
h. Varying pilot pressure to control valve
a. Control valve ports are open to tank
with spool in neutral position
b. Excessive leakage in control valve
spool
c. Crossover relief valve is leaking
excessively
d. Crossover relief valve set too low
REMEDY
i. Replace manifold block on motor
ii. Check cartridge valve seals for damage
i. Rebuild or replace the motor
i. Check base machine hydraulic system
i. Check base machine hydraulic system
i. Check base machine hydraulic system
i. Check base machine hydraulic system
i. Adjust fl ow control to decrease fl ow to rotation
group
i. Check base machine hydraulic system
i. Replace crossover relief valve
i. Replace fl ow control valve
i. Check base machine hydraulic system
i. Replace electric solenoid
i. Rebuild or replace gearbox
i. Disassemble motor from gearbox and inspect to
determine cause of binding
i. Check base machine hydraulic system
i. Check base machine hydraulic system
i. Check base machine hydraulic system
i. Check base machine hydraulic system
i. Replace crossover relief valve
i. Replace crossover relief valve