DO NOT over grease pump bearings. Some grease will
escape from the grease tell-tale hole after lubrication.
This is normal, but excessive grease on pumps that use
mechanical seals can cause seal failure.
Strainers
Clean strainers regularly to avoid pump starvation.
Intervals between cleaning depend upon the application
and conditions.
Pump Disassembly Instructions
1. Truck engine must be turned off and PTO disengaged.
2. Bleed all product from the system as described
above. NOTE: There is a 1/4 in. NPT connection at
the bottom of some models that allows you to easily
drain the pump.
3. Remove the PTO shaft or hydraulic drive motor,
adapter, and coupling.
NOTICE: ADHERE CLOSELY TO ALL HAZARD
WARNINGS AND INSTRUCTIONS IN THE
“MAINTENANCE” SECTION OF THIS MANUAL.
4. Carefully clean the pump shaft. Begin at one end of
the pump, and make certain that the shaft is free of
nicks and burrs to prevent damage to the mechanical
seal when removing the head assembly.
5. Unscrew the bearing cover bolts and pull the
bearing cover and gasket off the shaft. Dispose of
the bearing cover gasket.
6. Unscrew the opposite bearing cover bolts and pull
the bearing cover and gasket off the shaft. Dispose
of the bearing cover gasket.
7. Remove the locknuts and lockwashers in place:
7.1 Bend the lockwasher tab up and unscrew the locknut
counterclockwise and remove it from the shaft.
7.2 Pull the lockwasher off the shaft. Check the
lockwasher for damage and replace if needed.
7.3 Repeat steps 7.1 and 7.2 on the opposite end of
the shaft.
8. Unscrew the head bolts and carefully pry the head
from the pump casing.
9. Pull the head off the shaft. The head O-ring, bearing
and mechanical seal will come off with the head
assembly. Detach and dispose of the head O-ring.
9.1 Take the bearing out of the housing in the head.
9.2 Remove the mechanical seal. Using two
screwdrivers, gently push the backside of the seal
jacket to remove the seal from the head (see Figure
7). Be careful when using the screwdrivers on the
seal faces. The seal faces can be damaged. Detach
and dispose of the mechanical seal O-rings.
Seal jacket
driver tabs
Seal jacket
Figure 7
10. Remove the rotor and shaft from the pump casing.
While removing the shaft, cup one hand underneath
the rotor so the vanes and vane drivers do not fall out.
Carefully set aside the rotor and shaft, vanes and vane
drivers for future reassembly.
11. Repeat steps 8 and 9 above to remove the remaining
components from the opposite side of the pump.
Pump Assembly Instructions
Before reassembly, check each component part for wear
or damage. If necessary, replace flawed parts. Wash out
the bearing/seal recess of the head and remove any burrs
or nicks from the rotor and shaft.
1. Reassemble the first side of the pump by inserting a
new head O-ring into the groove of the head. Lightly
lubricate the O-ring to facilitate installation. Start on
one side of the groove and stretch the O-ring into the
groove (see Figure 8).
10
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