SPP Pumps Auto Prime Q Series - Workshop Manual - Manual (Page 6)

Manual No/Rev
W72-021E / 8
Workshop Manual for
AUTOPRIME Q Range Pump Units
Our policy is one of continuous improvement and we reserve the right to alter specifications at any time
Page 6 of 36
4. SERIAL NUMBER
The serial number plate is fitted inside the
control panel door.
This serial number must be quoted in any
enquiry for spare parts or service.
5. FAULT FINDING
5.1 Fault Finding Guide
Unit does not start
• Fuel consumed.
•
Trip switches need resetting.
• Warning lights on & shutdown circuit
activated.
• Battery with low charge level.
• Refer to engine supplier’s manual for
engine checks.
Unit does not prime
• Volute drain tap open.
• Air leak in priming system.
•
Air leak in suction hoses or fittings
• Blockage in suction hoses or strainer.
• Non-return valve not sealing.
• Internal damage to hose from solenoid
valve to vacuum pump.
• Solenoid valve not operating.
• Solenoid valve blocked.
• Priming tank air filter blocked.
• Priming tank knitmesh blocked.
• Vacuum pump belts loose or broken.
• Vacuum pump electric clutch not
engaged.
• Vacuum pump failure.
• Suction head too great.
Unit does not pump
• Blockage in delivery hoses.
• Blockage in impeller.
• Excessive impeller clearances.
•
Broken Impeller.
• Pump drive coupling disengaged.
• Delivery head too great.
5.2 Priming System Checks
Disconnect the suction hose. Place a flat
board over the suction fitting to check that
the priming system and vacuum pump is
working.
If a vacuum gauge is fitted to the suction
the vacuum pump should produce a
vacuum of at least 9 metres water.
5.3 Drive Belt Checks
The vacuum pump drive belts run between
the pump shaft and the electro magnetic
clutch on the vacuum pump. See the
maintenance instructions in section 7.11 for
the belt tensioning method.
5.4 Vacuum Pump Clutch Checks
The vacuum pump clutch is electrically
operated. If the clutch is disengaged the
belts still turn but the centre of the clutch
will be stationary.
The clutch requires 12 volts to actuate it.
This voltage controlled by a timer and
supplied via a relay by wire No 22 of the
wiring loom. If the wiring is disturbed during
investigations ensure that it is replaced
correctly.
The priming system electrical circuit is
protected by a circuit breaker mounted on
the control panel. If this trips out, push the
central button to reset. If the breaker will not
reset or is constantly tripped then there is
an electrical fault.
The level sensing probes control the
electrical supply to the clutch, with a timer.
If there is no electrical supply to the clutch,
check that the power light is illuminated on
the priming control box. If this is on then
disconnect the clutch and check if there is
12 Volts across the wires. If there is then
the clutch has failed and should be
replaced.
SPP Pumps Limited
Crucible Close, Mushet Industrial Park,
Coleford, Gloucestershire, ENGLAND,
GL16 8PS
Tel: +44(0)1594 832701
Fax: +44(0)1594 836300