SECTION TSM 630 ISSUE J PAGE 8 OF 10
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.
Carbon graphite bushings with extra interference fits are
frequently furnished for high temperature operation. These
bushings must be installed by a shrink fit.
1. Heat bracket or idler to 750ºF.
2. Install cool bushing with a press.
3. If facilities are not available to reach 750ºF. temperature,
it is possible to install with 450ºF. temperature; however
the lower the temperature the greater the possibility of
cracking the bushing.
Consult factory with specific questions on high temperature
applications. Refer to Engineering Service Bulletin ESB-3.
INSTALLATION OF CARBON
GRAPHITE BUSHINGS
PUMP
SIZE MODEL
STANDARD
END
CLEARANCE
(INCH)
TURN
BEARING
HOUSING
CCW LENGTH
ON OD (INCH)
ADDITIONAL
LENGTH ON
OD BEARING
HOUSE FOR
0.001" END
CLEARANCE
(INCH)
G
124A
4124A
0.003” 0.60” 0.20”
H
HL
124A
4124A
126A
4126A
123A
4123A
0.003” 0.75”
.22”
127A
4127A
0.005” 1.125”
AK
AL
K
KK
L/LQ
LL
124A
4124A
124AE
4124AE
126A
4126A
123A
4123A
0.005” 1.25”
.25”
127A
4127A
0.008” 2”
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 2.
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 your Viking Pump distributor.
THRUST BEARING ADJUSTMENT
SIZE G, H, HL, AK, AL, K, KK, L, LQ
& LL PUMPS
TABLE 2 - END CLEARANCE CHART
9. Install the lipseal (with lip toward end of shaft) and
bearing spacer collar in the outer end cap and turn the
end cap into the bearing housing until tight against the
bearing. Lock in place with two set screws in the flange
of the bearing housing.
10. 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
20-30 ft.–lbs. torque (G), 50-70 ft.–lbs. torque (H, HL) or
100-130 ft.–lbs. torque (AK, AL, K, KK, L, LQ, LL). 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.
11. Adjust pump end clearance as in Thrust Bearing
Adjustment page 8.
12. Lubricate all grease fittings with multi-purpose grease,
NLGI #2. G size has sealed bearing and is not
regreasable.
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.
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