MR−03955
JS SERIES PUMPS
FM
APPROVED
PAGE C − 11
MAINTENANCE AND REPAIR
2. Install the pump on the stand (26), and secure it
with the screws (21).
3. Lubricate the pump as indicated in
LUBRICA-
TION
before returning the pump to service.
LUBRICATION
All references are to FIGURE C−2.
The upper screw plug (268) in the motor
housing is used for testing
only;
do not
add oil through this plug.
Before installing or removing the screw plugs
(268), always clean the area around the plugs to
prevent contamination of the oil.
Discard the plug O-rings (269) if the plugs are re-
moved. Lubricate the new O-rings with oil -
not
grease
- before installing them
.
The seal assemblies (218 and 260) are lubricated
by a reservoir of oil in the seal housing (257).
Draining Oil
1. Lay the pump flat on a work surface with one of
the two screw plugs (268) in the seal housing
(257) facing up; slowly open the plug to release
any pressure.
2. Place a clean container under the lower plug,
remove, and roll the pump on its side to drain
the seal housing.
Condition Of Oil
1. Check the condition of the oil drained from the
pump.
2. If the oil is clear, it can be reused.
3. If the oil is milky or contains a small amount of
water, it must be changed.
4. If the oil contains a large amount of water, it
must be changed, and the lower seal assembly
(260) must be checked before the pump is put
back in operation.
Adding Oil
1. Lay the pump flat on a work surface with one of
the two screw plugs (268) in the seal housing
(257) facing up; slowly open the plug to release
any pressure.
2. Remove the second (lower) screw plug in the
seal housing, and add SAE 10W 30 motor oil
through the top plug hole until it escapes from
the lower plug hole.
3. Lubricate and install new O-rings (269), and in-
stall and tighten the plugs (269).
