11.
Pack the double row ball bearing with multi-purpose
grease, NLGI #2 and press into the bearing housing,
with shield side toward the coupling end of the shaft. See
“Figure 6” on page 5
. (AS, AK and AL size pumps do
not use a shielded bearing). Install the snap ring to hold
the bearing in place on GG, HJ and HL size pumps.
AS, AK, AL:
Install the lip seal in the bearing housing
end of the cap. The lip should face towards the end of the
shaft. Put the bearing spacer sleeve in the lip seal and
install in the bearing housing and tighten the setscrews
securely. See
“Figure 7” on page 5
.
12.
Insert a brass or plastic bar through the port opening
between the rotor teeth to keep the shaft from turning.
13.
Start the thrust bearing assembly into the casing. Turn
by hand until tight. This forces the rotor against the head.
Replace and tighten the locknut on the shaft.
14.
Remove brass or plastic bar from port opening
15.
Adjust the pump end clearance. Refer to
“Thrust Bearing
Adjustment” on page 9
.
INSTALLATION: CARBON
GRAPHITE BUSHINGS
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.
THRUST BEARING ADJUSTMENT
1.
Loosen the two screws in the face of the thrust bearing
assembly.
Turn the 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
noticeable drag.
2.
Make a mark on the outside diameter of the bearing
housing and a corresponding mark on the casing.
3.
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” on page
9
.
4.
After the adjustment is made, tighten the two setscrews
in the face of the bearing housing assembly to secure
the position. Your pump is now set with standard end
clearances and locked.
Operating the pump at higher temperatures or viscosities
may require additional end clearance. Contact your Viking
Pump
®
representative for those clearances.
TABLE 1: STANDARD END CLEARANCE
Pump Size
Distance in Inches on O.D.
of Bearing Housing
Standard End
Clearance
GG
0.69 (11/16)
.005
HJ, HL
0.94 (15/16)
.005
AS, AK, AL
1.25 (1-1/4)
.008
⚠
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.
⚠
DANGER !
Before opening any Viking pump liquid chamber
(pumping chamber, reservoir, relief valve adjusting cap
fitting, etc.) be sure:
1. That any pressure in the chamber has been
completely vented through the suction or discharge
lines, or other appropriate openings or connections.
2.
That the driving means (motor, turbine, engine, etc.)
has been “locked out” or made non-operational, so that
it cannot be started while work is being done on pump.
3. That you know what liquid the pump has been handling
and the precautions necessary to safely handle the
liquid. Obtain a material safety data sheet (MSDS) for
the liquid to be sure these precautions are understood.
Failure to follow above listed precautionary measures
may result in serious injury or death.
TSM 1741 | Issue B | Page 9 of 20
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