Hale MG - Manual (Page 93)

Muscle Pumps
5-29
L. Tank to Pump Check Valve
1. Drain the water tank and the pump.
2. Disconnect the control linkage at the
Tank-to-Pump Valve.
3. Disconnect both ends of the flexible hose
connecting the water tank to the Tank-to-
Pump valve. Then, slide the flexible hose
toward the water tank outlet or the Tank-
to-Pump valve plumbing.
NOTE: If the tank-to-pump valve is air-operated,
drain the vehicle’s air system and disconnect the
supply and the return line on the valve actuator, but
do not remove the actuator from the valve. Also,
the tank-to-pump valve may be connected to the
pump body by cap screws or studs with nuts. If
studs are used, it may be necessary to remove some
or all of the studs to remove the valve. If so,
remove only the studs necessary to remove the
valve, as any studs left will assist in realigning the
valve during installation.
4. Remove the eight 7/16-14UNC X 1-1/2
inch long cap screws retaining the tank-to-
pump valve to the pump body.
5. Remove the tank-to-pump valve and
associated plumbing.
NOTE: The back flow valve is a flat butterfly
plate with two pivots attached at the top. These
pivots fit into two open pivot sockets in the pump
body. When the gasket is removed, the back flow
valve may fall out.
6. Remove the old gasket from the pump
body.
7. Remove the back flow valve.
8. To install the back flow valve, first clean
all of the gasket surfaces on the pump
body and the tank-to-pump flange.
9. Install the back flow valve. Using two
fingers, hold the pivots in the pivot
sockets and check the valve for freedom
of movement.
10. Install a new gasket.
11. Apply Loctite 242 to the eight 7/16-
14UNC X 1-1/2 inch long cap screws and
attach the tank-to-pump valve to the pump
body. Tighten to 53 ft-lb (72 Nm).
12. Slide the flexible connection hose so it is
evenly spaced and secured on the water
tank outlet and the tank-to-pump valve
plumbing.
13. Attach the tank-to-pump valve controls
and linkage.
14. Fill the pump and test the valve for proper
operation and leaks.
M. Suction Extension and Suction Tube
1. Place apparatus out of service.
2. Open and drain pump body.
3. Remove twelve 7/16-14UNC X 1-1/4 inch
long cap screws from suction tube flange.
4. Clean suction tube and all components.
5. Remove fourteen 1/2-13UNC X 1-1/4
inch long cap screws from the suction tube
extension.
6. Clean the suction tube extension and all
components.
7. Clean seating surfaces of pump body,
housing, suction tube extension and
suction tube.
8. Place a new gasket on the seating surface
of the pump body. Apply a light coat of
grease to the gasket to hold it in place.
9. Reinstall suction tube extension, insert
fourteen 1/2-13UNC X 1-1/4 inch cap
long screws, torque to 65 ft-lb (88N-m).