Aussie Pumps MINE BOSS SCUD 351 Manuel d'instruction de l'opérateur - Page 13
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Mar 2021
Resetting the Safety Valve
A pressure spike will cause the
safety valve to 'blow' to prevent
damage to the pump seals.
A pressure spike is generally caused
by the unloader for the following
reasons.
1. Worn nozzles.
Worn nozzles, fitted in the end of
the lance, result in less water
bypassing back through the
unloader to cool & lubricate it.
Without sufficient flow the
unloader will overheat and wear.
A drop in pressure on the gauge
indicates nozzle wear. Replace
worn nozzles.
2. Dirt in the unloader may cause it
to jam. Clean out unloader &
check inlet filter fitted and clean.
3. Leaks in the system can cause
unloader 'chatter'. This will lead
to the unloader wearing
prematurely. All leaks must be
fixed before using the machine.
The safety valve should only be
reset after checks to ensure the
PUMP PARTS WBL1114 (Scud 100)
WORK SMART ... STAY SAFE
unloader valve is working correctly.
If in doubt contact, your nearest
Aussie Eco-clean service centre.
The following steps should be taken
to reset the safety valve, with the
unit running.
1. Unscrew the lock nut (C) on the
safety valve and the adjusting
screw (D), should be screwed in
all the way.
2. Using an allen key, loosen the
lock nut (B) on the unloader and
wind the unloader knob (A) in
gradually
until
the
required
pressure is obtained whilst the
trigger is pulled and water is
running through the pump. Do
not exceed the maximum rated
pressure of the pump.
3. The lock nut (B) should then be
wound down until it grounds out
at the bottom (do not over
tighten as this will further adjust
the pressure) and locked with use
of the allen key. Paint mark across
the nut and knob to identify any
| Aussie Scud, Ultra A & Predator A... Operator's Instruction Manual
tampering with the setting.
4. With the pump running at the
required pressure, the adjusting
screw (D) on the safety valve
should be wound out until there
is a slight drip. Screw it in one
quarter of a turn, or until the drip
stops, this will set the safety valve
10% over the required pressure.
The lock nut (C) should then be
locked off. Paint mark to identify
any tampering.
5. Repeat running with the trigger
open and then closed two or
three times to ensure safety valve
A
B
UNLOADER
Kit No.
12
64
70
83
141
166
Aussie Pumps
doesn't blow off pressure.
6. If safety valve continues to trip
contact your nearest Aussie Eco-
clean service centre.
This video demonstrates how to
adjust the unloader and the safety
valve (view online on Cold Water
Blaster Spares page)
C
SAFETY
VALVE
Description
Pieces
Seal Kit Minor
15
Oil Seal Kit
3
Seal Kit Major
21
Full Oil Seal Kit
8
Valve Kit
12
Valve Cap Kit
12
D
13