Page 8 Section 7 Troubleshooting
MSD SABER SERIES SHEARS
INTERNAL ROTATION CONTROL SYSTEM TROUBLESHOOTING
GUIDE
if equipped, continued
SYMPTOM PROBABLE CAUSE REMEDY
1. Will not rotate, continued
2. Rotation very slow
e. Directional valve not operating
- spool sticking
- faulty electrical signal
- faulty valve solenoid coil
f. Flow control valve cartridge is faulty
g. Accumulator does not charge with
hydraulic fl uid
a. Operating pressure is too low
b. Flow control valve cartridge
c. Faulty unloading valve
d. Crossover relief bypassing oil
e. Operating fl ow is too low
i. Check electrical signal to valve coils. If
the electrical signal is good, the coil is
faulty and must be replaced.
ii. Check continuity of valve coil.
i. Remove, check for cartridge contamina-
tion.
ii. Replace fl ow control valve.
i. Unloading valve is faulty. Replace un-
loading valve.
i. Check pressure at the gauge “G” port;
this should be 2000 -2500 PSI; adjust
pressure reducing valve if necessary.
i. Remove, check for contamination.
ii. Replace fl ow control valve.
i.Check electrical ground wire at the
unloading valve.
ii. Remove cartridge and check for con-
tamination or seal damage.
i. Replace crossover relief valve.
i. Adjust shear fl ow control to increase
fl ow to the rotation assembly.
