Remove packing gland nuts.
Tap shaft forward approximately 1/2 inch and remove pair of
half round rings under inner bearing spacer collar. There is
no half round rings on H and HL size pumps.
Carefully remove rotor and shaft to avoid damaging bracket
Remove packing gland from side of bracket.
Loosen setscrews. Two on H and HL size pumps, four on
all other sizes. With a spanner wrench, remove both end
caps with lip seals. Remove ball bearing. Refer to Figure 5.
Remove packing and packing retainer washer.
Clean all parts thoroughly and examine for wear and
damage. Check lip seals, ball bearing, bushings and idler
pin and replace if necessary. Check all other parts for nicks,
burrs, excessive wear and replace if necessary.
Wash bearings in clean solvent. Blow out bearings with
compressed air. Do not allow bearings to spin; turn them
slowly by hand. Spinning bearings will damage race and
balls. Make sure bearings are clean, then lubricate with
nondetergent SAE 30 weight oil and check for roughness.
Roughness can be determined by turning outer race by
If bearings have roughness, bearings will need to be
Casing can be checked for wear or damage while mounted
Install bracket bushing. If bracket bushing has a lubrication
groove, install bushing with groove at 6:00 oclock position in
bracket. If carbon graphite, refer to Installation of Carbon
Graphite Bushings, page 11.
Coat shaft of rotor shaft assembly with non-detergent SAE
30 weight oil. Start end of shaft in bracket bushing turning
from right to left, slowly pushing rotor in casing.
Place packing retainer washer in bottom of packing chamber
and pack pump with new packing. Use packing suitable for
liquid being pumped. Install packing, staggering the joints
from one side of shaft to other. Lubricate packing rings with
oil, grease or graphite to aid assembly A length of pipe will
help to seat each packing ring.
Install packing gland, capscrews and nuts. Back rotor and
shaft out of casing just far enough to insert packing gland
through side opening of bracket over end of shaft. Make
sure gland is installed square and nuts are tightened evenly.
Tighten nuts wrench tight then back off until gland is slightly
Coat idler pin with non-detergent SAE 30 weight oil and
place idler and bushing on idler pin in head. If replacing
carbon graphite bushing, refer to Installation of Carbon
Graphite Bushings, page 11.
Using a .010 to .015 inch head gasket, install head and idler
assembly on pump. Pump head and casing were marked
before disassembly to insure proper reassembly. If not, be
sure idler pin, which is offset in pump head, is positioned
toward and equal distance between port connections to
allow for proper flow of liquid through pump.
If pump is equipped with jacketed head plate, install at this
time along with new gasket.
Tighten head capscrews evenly.
If pump was equipped with a relief valve and it was removed
during disassembly, install on head with new gaskets. Relief
valve adjusting screw cap must always point toward suction
port. Refer to Figures 1, 2 and 3 on page 1. For relief valve
repair or adjustments, refer to Pressure Relief Valve
Instructions, page 11.
Slide inner spacer collar over shaft with recessed end facing
rotor. H and HL size bearing spacer collars are not
Place pair of half round rings on shaft and slide inner
bearing spacer collar over half round rings to lock them in
place. There is no pair of half round rings on H and HL size
pumps. Refer to Figure 5, page 4.
Press lip seal, lip facing end of shaft, in inner end cap and
insert end cap through shaft end of bracket. Turn end cap
clockwise, looking at shaft end, until it engages threads.
End cap spanner wrench holes must be facing rotor. Turn
end cap with spanner wrench until it projects slightly from
opening on side of bracket. End cap must not be turned so
far that lip seal drops off end of spacer collar on shaft or end
cap becomes disengaged from threads. Refer to Figure 5,
If this happens, remove inner spacer collar, half round rings
and end cap and start over at Step 7.
Pack ball bearing with multi-purpose grease, NLGI #2.
Place on shaft and push or gently drive in place in bracket.
Press lip seal, lip facing end of shaft, in outer end cap and
insert end cap in bracket. Turn end cap in bracket until it is
tight against bearing. Refer to Figure 5, page 4.
Put lockwasher and locknut on shaft. Insert length of
hardwood or brass through port opening between rotor teeth
to keep shah from turning. Tighten locknut to 100 ft.-lbs.
torque. This is equal to a 100 lb. load applied at a 1
distance from locknut. Bend one tang of lockwasher into
slot of locknut. If tang does not line up with slot, tighten
locknut until it does. Failure to tighten locknut or engage
lockwasher tang could result in early bearing failure and
cause damage to pump.
Remove length of hardwood or brass from port opening.
Adjust pump end clearance. Refer to Thrust Bearing
Adjustment, page 11.
Lubricate all grease fittings with multi-purpose grease, NLGI