Crane 104918, Installation And Operation Manual

Page: 11 / 28

11
SECTION F: SERVICE AND REPAIR
NOTE: All item numbers in ( ) refer to Figures 16 thru 19.
CAUTION ! - Operating pump builds up heat and
pressure; allow time for pump to cool to room
temperature before handling or servicing. Slowly
remove pipe plug prior to servicing as housing
may be pressurized.
F-1) Lubrication:
Anytime the pump is removed from operation, the cooling oil
in the motor housing (6) should be checked visually for oil
level and contamination.
F-1.1) Checking Oil:
Motor Housing -
To check oil, set unit upright. Remove pipe
plug (39) from motor housing (6). With a fl ashlight, visually
inspect the oil in the motor housing (6) to make sure it is
clean and clear, light amber in color and free from suspended
particles. Milky white oil indicates the presence of water. Oil
level should be just above the motor when pump is in vertical
position.
F-1.2) Testing Oil:
1.)
Place pump on it’s side, remove pipe plug (39), from
motor housing (6) and drain oil into a clean, dry container.
2.) Check oil for contamination using an oil tester with a
range to 30 Kilovolts breakdown.
3.) If oil is found to be clean and uncontaminated
(measuring above 15 KV. breakdown), refi ll the motor
housing as per section F-1.4.
4.) If oil is found to be dirty or contaminated (or measures
below 15 KV. breakdown), the pump must be
carefully inspected for leaks at the shaft seal (28), cord
assemblies (16) and (56 if used), square ring (27) and
pipe plug (39), before refi lling with oil. To locate the
leak, perform a pressure test as per section F-1.3.
After leak is repaired, dispose of old oil properly, and
refi ll with new oil as per section F-1.4.
F-1.3) Pressure Test:
Pumps that have had the oil drained from the Motor
Housing -
Apply pipe sealant to pressure gauge assembly
and tighten into pipe plug hole (See Figure 3). Pressurize
motor housing to 10 P.S.I. Use soap solution around
the sealed areas and inspect joints for “air bubbles”.
If, after fi ve minutes, the pressure is still holding constant,
and no “bubbles” are observed, slowly bleed the pressure
and remove the gauge assembly. Replace oil as described in
section F-1.4. If the pressure does not hold, then the leak must
be located and repaired.
Pumps that have NOT had the oil drained from the Motor
Housing -
The pressure test may be done with the oil at its
normal level. Remove pipe plug (39) from motor housing (6).
Apply pipe sealant to pressure gauge assembly and tighten
into hole (See Figure 3). Pressurize motor housing to 10 P.S.I.
Use soap solution around the sealed areas above the oil level
and inspect joints for “air bubbles”.
For sealed areas below the oil level, leaks will seep oil. If, after
fi ve minutes, the pressure is still holding constant, and no
“bubbles”/oil seepage is observed, slowly bleed the pressure
and remove the gauge assembly. If the pressure does not hold,
then the leak must be located and repaired.
Seal Chamber (DS Units Only)- Set unit on its side with
fi ll plug (44) downward, remove plug (44) and drain all oil
from seal chamber. Apply pipe sealant to pressure gauge
assembly and tighten into hole in outer seal plate (29).
Pressurize seal chamber to 10 P.S.I. and check for leaks as
outlined above.
CAUTION ! Pressure builds up extremely
fast, increase pressure by “tapping” air
nozzle. Too much pressure will damage
seal. DO NOT exceed 10 P.S.I.
F-1.4) Replacing Oil:
Motor Housing-
Set unit upright and refi ll with new cooling
oil as per Table 1 (see parts list for amount). Fill to just above
motor as an air space must remain in the top of the motor
housing to compensate for oil expansion (see Fig. 15 or 17).
Apply pipe thread compound to threads of pipe plug (39) then
assemble to motor housing (6).
Important ! - For single phase units, oil level
should be below capacitor
Seal Chamber (DS Units Only)- Set unit on its side, with
plug (44) upward, and refi ll with new oil as per Table 1 (see
parts list for amount). Apply pipe thread compound to threads
of pipe plug (44) and assemble to outer seal plate (29).
Warning ! - Do not over fi ll oil. Over fi lling of
motor housing with oil can create excessive
and dangerous hydraulic pressure which
can destroy the pump and create a hazard.
Over
fi lling oil voids warranty.
FIGURE 4