Aussie Pumps AB Scud 40 Manuel d'instruction de l'opérateur - Page 9

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March 2018

TROUBLE SHOOTING GUIDE

FAULT

Pump running normally but

pressure low on installation

Fluctuating Pressure

Pressure low after period of

normal use

Pump Noisy

Presence of water in oil

Water dripping below pump

Oil Dripping

Unloader valve switches

repeatedly when gun is off

Leaky piston rod

Leaky by-pass at nominal

pressure

Pressure gauge shows high

pressure fluctuations when

shutting off gun

Engine will not start

For engine troubleshooting refer to the Honda engine handbook.

Aussie AB Scud Cadet Series ... Operation & Maintenance Manual

CAUSE

Pump sucking air

Valves sticking

Unloader valve seat faulty

Nozzle incorrectly sized

Worn piston packing

Valves worn

Valves blocked

Pump sucking air

Worn piston packing

Nozzle worn

Check valves worn

Check valves blocked

Unloader valve seat worn

Worn piston packing

Cracked pistons as a result of dry

running

Air in suction

Broken or weak suction or delivery

valve spring

Foreign matter in valves

Worn bearing

Excessive temperature of liquid

Oil seal worn

High humidity in air

Piston packing worn

Piston packing worn or plunger

retainer worn

Travel plug in use on pump

Oil seal worn

Leaking gun and/or pressure pipe.

Leaky sleeve

Worn out kick-back valve body

Leaky seals

Defective O-Ring/Support Ring

Nozzle too small, too much water on

by-pass.

Worn out unloader valve

Valve set too high above operating

pressure

Dirty valve

Out of petrol

Engine defect

Aussie Pumps

REMEDY

Check water supply and possibility of air

ingress.

Check and clean or replace if necessary

Check and replace

Check water supply and air ingress at

joints in suction line

Check and replace

Check and clean

Check and replace

Replace pistons

Check water supply and connections on

suction line

Check and replace

Check and clean

Check and replace

Reduce temperature

Check and replace

Check and change oil twice as often

Check and replace

Replace with breather plug

Check and replace if necessary

Renew gun, seal pressure pipe

Renew sleeve

Check and renew as necessary kick-back

valve plate and seat

Renew seals

Renew piston rod seals and examine

surfaces in guide case

Install larger nozzle

Examine and renew as necessary.

Adjust the unloader at the operating

pressure.

Clean valve (removing lime deposits etc).

Grease parts before re-installing.

Fill tank with petrol

Return to engine service agent