Hale MG - Manual (Page 64)

Muscle Pumps
4-6
CONDITION POSSIBLE CAUSE SUGGESTED CORRECTION
RELIEF VALVE DOES
NOT RECOVER AND
RETURN TO
ORGINAL PRESSURE
SETTING AFTER
OPENING VALVES Dirt in system causing sticky
or slow reaction Relief valve dirty or sticky. Follow
instructions for disassembling, cleaning, and
lubricating.
Blocked relief valve. Clean the valve with a
small wire or straightened paper clip.
RELIEF VALVE
OPENS WHEN
CONTROL VALVE IS
LOCKED OUT Drain hole in housing, piston,
or sensing valve blocked Clean the hole with a small wire or
straightened paper clip.
Dismantle and clean the sensing valve.
UNABLE TO OBTAIN
PROPER SETTING
ON RELIEF VALVE Wrong procedure
Blocked strainer
Foreign matter in the Control
Valve
Hunting condition
Check instruction for setting the relief valve
and reset.
Check and clean the strainer in the supply line
from the pump discharge to the control valve.
Check the truck manual for the exact location.
Check and clean tubing lines related to the
relief valve and control valve.
Remove the control valve and clean.
Insufficient water supply coming from the
pump to the control valve. Check the strainer
in the Relief Valve system.
Remove the control valve and clean.
WATER IN PUMP
GEARBOX Leak coming from above
pump Check all piping connections and tank
overflow for possible spillage falling directly
on the pump gearbox.
Follow the procedures in Section 3 of this
manual for adjustment or replacement of
packing. Excess packing leakage permits the
flushing of water over the gearbox casing to
the input shaft area. Induction of this
excessive water may occur through the oil
seal or speedometer connection.
If mechanical seal is installed, there should be
no leaks. Inspect the oil seal and replace if
necessary.
DISCHARGE VALVES
DIFFICULT TO
OPERATE Lack of lubrication
Valve in need of more
clearance
Recommended weekly lubrication of
discharge and suction valve, use a good grade
of petroleum base or silicone grease.
Add gasket to the valve cover per the truck
manual. Multi-gasket design allows additional
gaskets for more clearance and free operation.
NOTE: Addition of too many gaskets to the
valve will permit leakage.