Viking Pump TSM410.1: F-FH 4625 - Manual (Page 3)

SECTION TSM 410 1 ISSUE D PAGE 3 OF 5
MaINTENaNCE
Model 4625 pumps are designed for long, trouble free
life under a wide variety of application conditions with a
minimum of maintenance, however, the following should be
considered
1. LUBRICATION - External lubrication must be applied
slowly with a handgun to all lubrication fittings every 500
hours of operation with multi-purpose grease, NLGI # 2
Do not over-grease Applications involving very high or
low temperatures will require other types of lubrication
Refer to Engineering Service Bulletin ESB-515 Consult
factory with specific lubrication questions
2. END CLEARANCE ADJUSTMENT - After long term
operation it is sometimes possible to improve the
performance of the pump, without major repair, through
adjustment of the end clearance of the pump Refer
to instructions under Reassembly of the pump for
information regarding this procedure
3. CLEANING THE PUMP - It is good practice to keep the
pump as clean as possible This will facilitate inspection,
adjustment and repair work
4. STORAGE - If the pump is to be stored or not used for
any appreciable length of time it should be drained and
a light coat of lubricating and preservative oil should be
applied to the internal parts
SUGGESTED REPAIR TOOLS: The following tools must be
available to properly repair Series 4625 pumps These tools
are in addition to standard mechanics’ tools such as open end
wrenches, pliers, screwdrivers etc Most of the items can be
obtained from an industrial supply house
1. Soft Headed Hammer
2. Allen Wrenches (some mechanical seals and set collars)
3. Adjustable Hook Spanner Wrench (2-810-043-375)
4. Arbor Press
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.
DISaSSEMblY PRESSURE RELIEF VALVES:
1. Viking pumps are positive placement pumps and must be
provided with some sort of pressure protection This may
be a relief valve mounted directly on the pump, an inline
pressure relief valve, a torque limiting device, a rupture
disk, or other device
2. If pump rotation is to be reversed during operation,
pressure protection must be provided on both sides of
the pump
3. Relief valve adjusting screw cap must always point
towards the suction side of the pump
4. Pressure relief valves should not be used to control
pump flow or regulate discharge pressure
SPECIAL MECHANICAL SEALS:
Extra care should be taken in repair of these pumps Be sure
to read and follow all special instructions supplied with your
pump
Review Fig. 2 and 3 before proceeding with disassembly
1. Remove Locknut and Lockwasher from the drive end of
the shaft Be sure to bend up the tab of the lockwasher
before attempting to remove locknut
2. Remove Packing Nut
3. Remove the Capscrews and the Head from the pump
It may be necessary to tap the drive end of the shaft
to loosen the head DO NOT PRY the head from the
casing as this may damage the gasket surface
4. Slide the rotor and shaft from the casing It may be
necessary to tap lightly on the drive end of the shaft in
order to slide the shaft through the ball bearing bore
The rotary member of the mechanical seal will stay with
the Rotor & Shaft when removed
5. Remove the ball bearing and bearing retainer washer
from the casing bore
6. Remove the rotary member of the mechanical seal from
the rotor shaft Carefully inspect the ceramic face for
wear and the o-ring in I D of the rotary member for cuts
or other signs of damage Replace if necessary
7. Remove the seal seat from the casing Use a simple tool
such as a wire or old screwdriver with a short hook bent
on the end Slide this hook into the crevice between
the seal seat and casing bushing and pull the seat out
the head end of the casing Inspect face for wear It
is recommended that a new mechanical seal be used
every time a pump is dissembled