Aussie Monsoon & Hurricane … Operation & Maintenance Manual
6
Australian Pump Industries
FAULT
CAUSE
REMEDY
Pump running normally
but pressure low on
installation
Pump sucking air
Valves sticking
Unloader valve seat faulty
Nozzle incorrectly sized
Worn piston packing
Check water supply and possibility of air
ingress.
Check and clean or replace if necessary
Check and replace
Check and replace
Check and replace
Fluctuating Pressure
Valves worn
Valves blocked
Pump sucking air
Worn piston packing
Check and replace
Check and replace
Check water supply and air ingress at
joints in suction line
Check and replace
Pressure low after period
of normal use
Nozzle worn
Check valves worn
Check valves blocked
Unloader valve seat worn
Worn piston packing
Check and replace
Check and replace
Check and clean
Check and replace
Check and replace
Pump Noisy
Air in suction
Broken or weak suction or delivery
valve spring
Foreign matter in valves
Worn bearing
Excessive temperature of liquid
Check water supply and connections on
suction line
Check and replace
Check and clean
Check and replace
Reduce temperature
Presence of water in oil
Oil seal worn
High humidity in air
Piston packing worn
Check and replace
Check and change oil twice as often
Check and replace
Water dripping below
pump
Piston packing worn
O.R plunger retainer worn
Check and replace
Check and replace
Oil Dripping
Oil seal worn
Check and replace if necessary
Valves switches
repeatedly when gun is off
Leaking gun and/or pressure pipe.
Leaky sleeve
Worn out kick-back valve body
Leaky seals
Renew gun, seal pressure pipe
Renew sleeve
Check and renew as necessary kickback valve plate and seat
Renew seals
Leaky piston rod
Defective O-Ring/Support Ring
Renew piston rod seals and examine
surfaces in guide case
Leaky by-pass at nominal
pressure
Nozzle too small, too much water.
Worn out by-pass valve
Install larger nozzle
Examine and renew as necessary,
poppet (16 for APR-11 for VD valves 10 for ADV-8 for Unifit valves), valve set
(14 or APR-12 for VD valves - 11for
AVD valves - 7 for Unifit) and by-pass
valve body.
Pressure gauge shows
high pressure fluctuations
when shutting off gun
Valve set too high above operating
pressure
Dirty valve
Adjust the unloader at the operating
pressure.
Clean valve (removing lime deposits
etc). Grease parts before installing.
Motor hums when
switched on but does not
start
Main voltage too low
Spray gun not activated
Cross section of extension lead too
small
Check electrical connection
Activate spray gun when switching on
Use correct dimension extension lead
TROUBLE SHOOTING GUIDE