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 2.
Loss-of-prime - Loss of prime after initial
CHAPTER IV - MAINTENANCE
prime has been established may be due to
the same conditions as outlined above for
15. Daily maintenance, reference Fig. 9.
initial prime.
A. Check engine crankcase oil level every 5 hours
and change every 25 hours. Dip stick on side of
B. Low Capacity
engine. Add oil if necessary.
1. Failure to deliver rated capacity may be
C. Check pump gearcase oil level. Remove oil
due to any of the following causes:
level plug on side of gearcase. Add oil if
a.
Suction lift too high.
Reposition
necessary.
pump as required.
D. Check connecting rod bearing grease cup. To
b.
Discharge point too high. Change
lubricate bearing, hand turn down grease cup
discharge system as required.
cap one quarter turn, twice daily. Fill cup as
c.
Suction leaks - Check as indicated
required.
under priming.
E. Flush out pump body with clean water.
d.
Collapsed suction line. Make sure
F. During freezing weather, make sure pump body
suction hose lining is not loose, or
is drained after pumping. Remove suction line
line crimped.
from liquid.
e.
Clogged suction - Clean suction inlet.
f.
Reduced engine speed - Make sure
16. Semi-Yearly, reference Fig. 9.
engine is properly serviced and
A. Engine - Consult "Engine Manual "(TM 5-2805-
adjusted. (Connecting rod should
257-14).
operate at approximately 60 strokes
B. Pump gearcase - Drain, flush and refill gearcase
per minute.)
to level plug. Capacity 2 pints.
C. Valve Noise
C. Connecting rod bearing grease cup. Remove
cup from connecting rod. Clean, flush and refill
Both the suction and check valves should close with
cup.
a distinct slap. A change to a very loud snap
D. Inspect rubber diaphragm. Should the rubber
indicates excessively high suction and/or discharge.
show signs of cracking, replace the diaphragm.
Make sure that the installation does not exceed the
Refer to diaphragm replacement par. 18.
maximums. (Reference, Chapter II, Par. 7 and Fig.
E. Inspect the inlet and outlet rubber flap valves.
2.)
Should the rubber flap valves show signs of
wear or cracking, replace flap valves. Refer to
pars. 19 and 20.
F. Inspect the connecting rod needle bearing. Re-
fer to connecting rod needle bearing
replacement par. 21. If inspection indicates
bearing is worn, it should be replaced.
G. Wheel bearings - The wheels contain two sealed
type ball bearings with no provision for
lubrication.
Bearings are presealed at the
factory.
17. Service Check List
A. Priming
1. Initial prime - failure to prime initially may
be due to:
a.
Suction lift too high. Total lift must
be no greater than 25 feet.
b.
Suction
leak
-
Check
hose
connections, check valve and seat
gasket, diaphragm for cracks and
make sure that inlet end of suction is
submerged in liquid but not buried in
mud and/or foreign matter.
c.
Valve leak - Check for proper seating
and easy operation.
6
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