Viking Pump TSM685.1: GS-HL 855 - Manual (Page 13)

SECTION TSM 685.1 ISSUE G PAGE 13 OF 16
ADjUSTING END CLEARANCE
Use either of the following procedure to properly adjust the
end clearance when replacing shims.
fIGURE 25
PRESSURE RELIEf VALVE INSTRUCTIONS
Before opening any Viking pump liquid cham-
ber (pumping chamber, reservoir, relief valve
adjusting cap fitting etc.) Be sure:
1. That any pressure in chamber has been
completely vented through 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 precaution-
ary measures may result in serious injury or
death.
DANGER !
fIGURE 24
PROCEDURE A
After rotor has been installed and locknut has been
positioned and retained, insert a feeler gage of the proper
end clearance into the port and between two rotor teeth (See
Figure 24). For convenience, remove head O-ring and
install one 0.007” shim onto the head. With idler on idler pin,
place the head into the pump casing. With the capscrews
tight, the feeler gage should fit snugly; otherwise shims
should be added or reduced in thickness until the proper
clearance is attained.
PROCEDURE B
If the pump is in line and ports are not accessible, remove
the head and shims. Put the head back on (without shims)
and measure the gap as shown (See Figure 25). After
determining the gap between the head and casing, select
a combination of shims equal to the measured gap plus the
desired end clearance (See Figure 25). Remove head, install
shims then install head. Tighten the head capscrews and
check the pump clearance by making sure the pump turns
freely by hand. Since the pump shaft is concealed, it is best
to work up the proper end clearance because it is difficult to
determine when there is too much end clearance with this
approach.