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I
;'
SERVICE
&
MAINTENANCE INSTRUCTIONS
GENERAL PUMP INFORMATION
Direction of rotation on all
"L"
Series pumps with
two
ball checks in the front plate may be reversed
by removing the tie bolts and rotating back plate,
thrust plate and body
180'.
It is important that the relationship of the back plate,
thrust plate, body and front plate is correct. You will
note
two
half moon cavities in the body which must
face away from the front plate. Note also a small
drilled hole in one
of
these cavities. This hole must
be
on the pressure side of the pump. Side
of
thrust
plate with mid
-
section cut away must be on suction
side of pump.
Suction side of back plate is always the side with
the larger port boss. Pumps using only one ball
check in the front plate cannot be reversed.
Refer to Placing Pump Back in Service, page 21.
Placing Pump Back Into
Service
1.
Before starting pump, it is recommended to
prime it first.
2.
If shop test stand is available, the following
procedure for testing rebuilt pumps is
recommended:
a.
Mount pump on test stand, making sure that
the proper level of clean oil is available in the
reservoir. Check suction line for leaks and
obstructions.
b.
Start pump and run for three minutes at
200
psi pressure.
c.
Intermittently
load
pump
to
500
psi
for
three
minutes.
d.
Intermittently load pump to 1000 psi for three
minutes.
e. Intermittently load pump to 2000 psi for three
minutes.
f.
Relieve pressure, remove pump from test
stand and check for looseness of drive shaft.
Check for leaks.
3.
It shop test stand is not available, the following
procedure for testing rebuilt pumps is
recommended:
a.
Mount pump on equipment and run pump at
1/2 engine speed at 200 psi pressure.
b.
By operating control valve, build pressure
intermittently for three minutes.
c. Increase engine speed to full throttle and
build pressure intermittently for three
minutes.
d.
Idle engine and check for leaks.
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