Crane 104872, Installation And Operation Manual

11

SECTION F: SERVICE AND REPAIR

NOTE:

 All item numbers in ( ) refer to Figures 16 thru 21.

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 housing (6). With a flashlight, 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), refill 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), cable assemblies

(16) and (56 if used), square ring (27) and pipe plug (39),

before refilling 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 refill 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 4).  Pressurize 

motor housing to 10 P.S.I. Use soap solution around the 

sealed areas and inspect joints for “air bubbles”. If, after 

five 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 

4). 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 five 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 

fill 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 refill 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 16, 18 or  

20). 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 refill 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 overfill oil. 

Overfilling of motor housing with oil 

can create excessive and dangerous 

hydraulic pressure which can destroy the 

pump and create a hazard. Overfilling oil 

voids warranty.

TABLE 1 - COOLING OIL - Dielectric

SUPPLIER

GRADE

BP

Enerpar SE100

Conoco

Pale Paraffin 22

Mobile

D.T.E. Oil Light

G & G Oil

Circulating 22

Imperial Oil

Voltesso-35

Shell Canada

Transformer-10

Texaco

Diala-Oil-AX

Woco

Premium 100

FIGURE 4