SPP Pumps Auto Prime Medium Head Open Set - AC & AL Range - Manual (Page 12)

Manual No/Rev
W72-002 / 11 Operators Handbook for
Diesel Driven Pump Sets
Our policy is one of continuous improvement and we reserve the right to alter specifications at any time
Page 12 of 16
5. Slide the seal assembly back along the
shaft to locate on backplate. Tighten
securing nuts and screws evenly.
6. Refit the shaft guard.
7.6 MECHANICAL SEALS
1. Ensure that the coolant/lubricant level is
maintained. It is imperative that the seals are
never run dry. Immediate seal failure will
result.
2.
Any contamination of the fluid should be
investigated immediately. Should a large loss
of fluid be experienced then the pump must
be stopped immediately.
3.
Replacement of the seals is considered a
workshop operation where higher standards
of cleanliness can be maintained and the
specialised tooling required is more readily
available.
7.7 NON-RETURN VALVE
1. A ball type non return valve is fitted to the
pump discharge.
2. The ball should be regularly checked for
freedom of movement and absence of debris
by inspection through the discharge.
3. On larger pumps the correct seating of the ball
can be checked through the delivery flange of
the valve body. The valve body should be
removed to check the seat for damage or
wear.
7.8 PUMP BEARINGS (Open coupled pump sets
only)
1. The pump ends employ grease lubricated
bearings which will give long service life
provided they are:-
a) Correctly lubricated at regular intervals
b) Cleaned and, if removed, refitted with
care
c) Serviced with clean tools and in a clean
area.
2. The early stages of bearing failure can be
detected by noting either unusual vibration,
bearing housing temperature rise or unduly
noisy operation. If any of these signs be
exhibited, the pump should be stopped and
the cause investigated.
3. Greased bearings are pre-packed with
lubricant during pump manufacture. Shrinkage
and normal loss of grease necessitates re-
lubrication at regular intervals. These
intervals will largely be determined by
site conditions. The recommendations
given in Table 1 are therefore for
guidance only.
Radial Bearing
Non drive end
(NDE)
Radial & Thrust
Bearing
Drive end (DE)
4 months
3000 hrs
4 weeks
750 hrs
Table 1 Guidance Intervals for bearing re-
greasing
4. The table is based on running speeds
of 1450rpm with a bearing temperature
not exceeding 70°C. Reduce the
interval by half for every 15°C above
70°C.
5. Clean both the grease fittings and
grease gun nozzle before use. For a
hand grease gun apply 2 or 3 strokes
to each nipple.
6. Overfilling can be as harmful to
bearings as under-lubrication.
Compaction of grease leads to it being
churned by the rolling action of the
bearings. This leads to overheating,
breakdown of the lubricant and bearing
failure.
7. Immediately after re-lubrication it is
normal for the temperature of the
bearing housing to rise in service. The
temperature should soon drop to
normal after a short period of running.
If the temperature remains elevated or
continues to rise, temporarily remove
the grease nipples and allow any
excess grease to escape.
7.9 VACUUM PUMP
Vacuum pump overhaul is beyond the
scope of this manual. Should the
vacuum pump be suspect then it is
recommended that an exchange unit is
fitted and the suspect unit returned for
examination.
7.10 VACUUM PUMP AIR FILTER
7.10.1 Standard air filter
Standard air filters are located in the
valve cover of the primary tank and
should be checked regularly for
cleanliness, distortion or damage (see
ATTENTION