
SECTION TSM 628.1 ISSUE A PAGE 6 OF 12
DANGER !
Before starting pump, be sure all drive
equipment guards are in place.
Failure to properly mount guards may
result in serious injury or death.
8. Using a .010 to .015 inch thick head gasket, install head
and idler assembly on pump. Pump head and casing
should have been marked before disassembly to ensure
proper reassembly. If not, be sure idler pin, which is offset
in pump head, is positioned toward the equal distance
between port connections to allow for proper flow of
liquid through pump. If pump is equipped with jacketed
headplate, install at this time along with new gasket.
Refer to Figure 5 & 6, page 5 for bearing housing assembly.
9. Install bracket lip seal (Item 18).
10.Install lip seal (lip toward end of shaft) in bearing housing.
11. “LS” Pumps: Pack the ball bearing with grease and push
or press the bearing into the bearing housing. Refer to
Figure 5, page 5.
Q and QS Size Pumps: Pack tapered roller bearings
with grease and press or push bearings into housing with
large end of inner races together. It is possible to install
bearings incorrectly. For proper assembly see Figure 6.
12.Install the lip seal in the end cap (with lip toward end
of shaft). Thread the end cap into the bearing housing
along with outer bearing spacer collar and tighten against
the bearing.
Q and QS SIZE PUMPS ONLY: Tapered roller bearings
require preload to operate properly. To set preload tighten
end cap so that inner races of bearings cannot be rotated
by hand. Back the end cap off to allow inner races to
rotate with slight resistance.
Lock end cap in place with two setscrews in the flange of
the bearing housing.
13.Slide inner spacer collar over shaft with recessed end
facing rotor. Q and QS bearing spacer collars are not
recessed.
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 Q and QS
size pumps.
14. Thread the bearing housing with lip seals; end cap, outer
bearing spacer collar and bearings installed into bracket.
15.Put lockwasher and locknut on shaft. Insert length of
hardwood or brass through port opening between rotor
teeth to keep shaft from turning. Tighten locknut to 120-
150 - ft.lbs. torque (LS) or 170-190 - ft.lbs. torque (Q and
QS) . 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 rest of pump. Remove length of hardwood or
brass from port opening.
16.Adjust pump end clearance as in Thrust Bearing
Adjustment, page 7.
1. Loosen the two set screws in the outer face of the bearing
housing and turn this thrust bearing assembly clockwise
until it can no longer be turned by hand. Back off counter-
clockwise until the rotor shaft can be turned by hand with
a slight noticeable drag.
2. For standard end clearance, back off the thrust bearing
assembly the required length measured on the outside
diameter of the bearing housing. See Table 1.
3. Tighten the two self-locking type “Allen” set screws, in the
outboard face of the bearing housing, with equal force
against the bracket. Your pump is now set with standard
end clearances and locked.
NOTE: Be sure the shaft can rotate freely. If not, back off
additional length on outside diameter and check again.
4. High viscosity liquids required additional end clearances.
The amount of extra end clearance depends on
the viscosity of the liquid pumped. For specific
recommendations, consult the factory. Table 1 shows the
additional bearing housing adjustment required for .001”
increase in end clearance.
THRUST BEARING ADJUSTMENT
PUMP SIZE
& MODEL
STANDARD
END
CLEARANCE
(Inch)
TURN BRG.
HOUSING
C.C.W.
LENGTH
ON O.D.
(Inch)
ADDITIONAL
LENGTH ON
O.D. BRG.
HOUSING FOR
.001” END CL.
(Inch)
LS 4124B 0.005 1.25 0.25
LS 4224B 0.01 2.50 0.25
Q & QS 4124B 0.01 3.10 0.31
Q & QS 4224B 0.015 4.65 0.31
TABLE 1
When installing carbon graphite bushings, extreme care
must be taken to prevent breaking. Carbon graphite is a
brittle material and easily cracked. If cracked, the bushing will
quickly disintegrate. Using a lubricant and adding a chamfer
on the bushing and the mating part will help in installation.
The additional precautions listed below must be followed for
proper installation.
1. A press must be used for installation.
2. Be certain bushing is started straight.
3. Do not stop pressing operation until bushing is in proper
position. Starting and stopping will result in a cracked
bushing.
4. Check bushing for cracks after installation.
INSTALLATION OF CARBON
GRAPHITE BUSHINGS
Before putting pump back into service, add grease to the
bracket grease fitting until it comes out of the relief fitting on the
opposite side of the bracket (use petroleum jelly, petrolatum or
other similar low melting point lubricant). Regrease the bearing
housing until grease comes out of the shaft end lip seal (use
multi-purpose grease NLGI #2).
RELUBRICATION