Viking Pump TSM420: HL-LL 4925 - Manual (Page 15)

SECTION TSM 420 ISSUE E PAGE 15 OF 18
A Viking pump that is properly installed and maintained will
give long satisfactory performance
If trouble does develop, one of the first steps toward finding
the difficulty is to in stall a vacuum gauge in the suction line
and a pressure gauge in the discharge line Readings on
these gauges often give a clue on where to start looking for
trouble
TROUBLESHOOTINg
DANgER !
Before opening any Viking pump liquid
chamber (pumping chamber, reservoir,
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.
(See detailed procedure for venting
the pumps, pages 4, 5 and 6).
2. That the driving means (motor,
turbine, engine, etc.) has been
“locked out” or made otherwise non-
operational so that it cannot be
inadvertently started while work is
being done on the 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.
A. Motor not hooked up or hooked up correctly - check
wiring
B. Something has gotten into pump and has jammed
rotating parts - remove head and take out
obstruction
C. End clearance has been set too close - adjust end
clearance
D. Drive equipment jammed - remove obstruction
1. PUMP WILL NOT START TO ROTATE.
2. PUMP fAILS TO PUMP.
A. Suction line valve not open - open valve
B. Suction strainer is plugged - clean strainer
C. Pump vapor bound - vent discharge lines
3. PUMP IS NOISY.
4. LOW CAPACITY
5. RAPID WEAR.
6. RELIEf VALVE DOES NOT fUNCTION
D. Relief valve bypassing - remove obstruction or
open valve Weld bead or other foreign material
under poppet, disassemble valve and remove
foreign material Valve setting too low for differential
pressure required - increase setting or get heavier
spring
E. Pump rotating wrong way - change direction of
motor rotation or change piping
f. No liquid in accumulator - check controls
g. Drive equipment broken - repair or replace
A. Cavitation (liquid vaporizing on suction side of
pump) increase head of liquid on pump; reduce line
loss in suction piping; insulate suction line; reduce
pump speed
B. Liquid all out of accumulator pump is starved - adjust
floats or time cycle
C. Relief valve chattering - increase pressure setting
of relief valve
D. Binding - check alignment of unit; check for pipe
strain
E. Drive equipment worn or damaged - repair or
replace
A. Motor running at wrong speed - check wiring
B. Speed too slow - change drive or get motor with
faster rated speed
C. Too much end clearance - adjust end clearance
D. Internal wear - replace worn parts
E. Pump too small - use a larger pump or two small
ones
f. Suction line too small - reduce length or increase
size
g. Relief valve opening - increase pressure setting
H. Bypass line valve open - adjust valve
A. Dirt in the system - install suction line strainer
temporarily until system is clean
B. Cavitation - liquid vaporizing on suction side of
pump) increase head of liquid on pump; reduce line
loss in suction piping; insulate suction line; reduce
pump speed
C. Pump misaligned or distorted - check pump drive or
alignment; remove any piping strain on pump
D. Running too fast - change drive or use larger pump
that could run slower
E. Pump runs dry part of time - check level controls to
be sure there is always liquid in the pump
A. Installed incorrectly - return-to-tank type relief valve
should be mounted on the head opening toward
the discharge side of pump Internal type relief
valve should be mounted so end cap points toward
suction port of pump