Hale Rear Mount - Manual (Page 8)

TESTING PRESSURE
The pumper should now be checked at 7/10 capacity at 200 PSI, and 1/2 capacity at 250 PSI. If
the apparatus fails to pump its required volume at either 200 or 250 PSI, it should be thoroughly
checked.
Compare results with performance of the pumper when new. An appreciable drop indicates need
for service.
ENGINE SPEED
Engine speed is important on all four tests and should be recorded, and compared to the original
speeds at time of delivery. Engine RPM should not exceed the engine manufacturers
recommended no load governed speed. Engine speed can, to some extent, be a guide to the
condition of the pump.
A substantially higher engine speed on any one of the tests, compared to the speed on the same
test when the pumper was new, can indicate air leaks, a restricted suction hose or strainers,
foreign matter within the pump, especially impellers, or too high a lift. A low engine speed, together
with poor pump performance indicates lack of engine power, worn clearance rings and/or
bypassing. Relief valves, booster tank plumbing and valves, and sometimes central drains can all
allow bypassing.
MISCELLANEOUS
During the tests the priming system should be checked. See instructions under “Final Test Before
Housing Pumper”.
The relief valve should also be checked.
PUMP TEST TROUBLESHOOTING
WHAT IS WRONG IF THE PUMPER DOES NOT MEET ITS CAPACITY AT ANY ONE OF THE
FOUR TESTS
1. Low Engine Horsepower. This is especially true when engine speeds tend to be lower than the
original speeds when you are approaching or near, but can not obtain performance at the four
test spots. Possible causes of low engine power:
!
Throttle linkage or wiring not opening engine throttle fully.
!
Ignition timing incorrect.
!
Restricted fuel flow due to clogged filter bowl or other restriction.
!
Engine running too hot.
The above causes are relatively simple to correct and sometimes can be adjusted immediately so
the test can proceed.
These causes are more serious and indicated a thorough engine tune-up or other repairs are
necessary:
!
Slipping Clutch or lack of transmission lockup
!
Exhaust restricted.
!
Leaking or sticking valves.
6