SPP Pumps Auto Prime Q Series - Workshop Manual - Manual (Page 7)

Workshop Manual for
AUTOPRIME Q Range Pump Unit
Manual No/Rev
W72-021E / 8
Our policy is one of continuous improvement and we reserve the right to alter specifications at any time
Page 7 of 36
If the 12 Volt supply is not provided to the
clutch, check the continuity of the cables
and rectify any bad connections.
If the control box does not provide the 12
Volt supply for the clutch the control box is
faulty and must be replaced.
5.5 Solenoid Valve Checks
The electrically operated solenoid valve is
connected to the top of the priming tank.
The valve is reliable but if a fault is
suspected it is most likely to be a problem
with the wiring. Wire No 28 of the loom
supplies 12 Volts, wire No 8 is an earth
return.
5.6 Priming Filter Checks
The priming tank air filter is mounted in the
top of the priming tank. To remove and
check the filter condition, follow the
instruction given in the maintenance section
of this manual.
5.7 Priming Tank Filter Checks
It is extremely unlikely that the priming tank
knitmesh filter will ever become sufficiently
blocked to prevent priming. Instructions for
dismantling the unit and removing and
cleaning the knitmesh filter are given in the
maintenance section of this manual.
5.8 Non Return Valve Checks
The volute non-return valve needs to seal if
the priming system is to function. The non-
return valve can be examined by removing
the discharge quick release coupling - see
the relevant section of the maintenance
instructions. Ensure that there is nothing
jammed under the valve especially at the
back around the valve hinge.
5.9 Air Leak Checks
It is extremely unlikely that there will be air
leaks at any of the priming system sealing
faces. Leaks may occur if the suction quick
release fitting has been moved or the
priming tank has recently been dismantled.
If the vacuum pump is working but not
achieving full vacuum fit a quick release
connection cap and gauge to the suction
hose. Run the unit to achieve a vacuum, as
indicated by the gauge, then turn the unit
off. Note how long the vacuum takes to
decay. A pump in full working order will
achieve a vacuum of 9 metres water and
hold it for in excess of five minutes.
5.10 Vacuum Pump Checks
If the vacuum pump is considered to be at
fault no attempt should be made to
dismantle it. Obtain a replacement unit.
To check the operation of the vacuum
pump,
disconnect the hose running
between the priming tank and the vacuum
pump.
Warning: The hose is stiff and very difficult
to remove. Do not disconnect the hose
while the unit is running. If any solid
objects, grit or mud are drawn up the hose
they will cause serious damage to the
internals
of the vacuum pump.
Disconnection of this hose should only be
considered as a last resort. Conduct other
investigations before resorting to this
course of action.
Once the hose between the vacuum pump
and the coalescer has been disconnected
start up the unit and place a small clean
board over the inlet to the vacuum pump.
The board should be held in place by the
action of the vacuum pump. Turn the unit
off before refitting the hose.
The oil in the coalescer is used to both
lubricate the vacuum pump and create an
effective seal. If the vacuum pump
performance is poor check the coalescer oil
level, after having drained any excess
water.
5.11 Electrical Checks
Please refer to SPP Pumps.