Barnes 4SE-L series, Installation And Operation Manual

9

SECTION E: PREVENTATIVE MAINTENANCE

As the motor is oil fi lled, no lubrication or other maintenance 
is required, and generally CP&S pumps will give very reliable 
service and can be expected to operate for years on normal 
sewage pumping without failing. However as with any 
mechanical piece of equipment a preventive maintenance 
program is recommended and suggested to include the 
following checks:

WARNING ! - Pressure builds up due to heat.

1)  Inspect motor chamber for oil level and contamination and 
 

repair as required per section F-1.

2)  Inspect impeller and body for excessive build-up or clogging 
 

and repair as required per section F-2.

3)  Inspect motor and bearings and replace as required per
  

section F-3.

4)  Inspect seal for wear or leakage and repair as required per
 

section F-4.

SECTION F: SERVICE AND REPAIR

NOTE: All item numbers in ( ) refer to Figures 12, 13, 14 
& 15.

F-1) Lubrication:

Anytime the pump is removed from operation, the cooling oil 
in the motor housing (2) 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  (5)  from  motor  housing  (2).  With 

a  fl ashlight,  visually 

inspect  the  oil  in  the  motor  housing  (2)  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 a vertical 
position.

F-1.2) Testing Oil:

1.  Place pump on it’s side, remove pipe plug (5), from motor
 

housing (2) 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 (measure
 

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 the pump must be carefully

inspected for leaks at the shaft seal (46), cable assemblies

(52) and (53), square ring (42) and pipe plug (5)    

before refi lling with oil. To locate the leak, perform

a pressure test as per section F-1.3. After leak is repaired,

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 2).  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 (5) from motor housing (2). 
Apply pipe sealant to pressure gauge assembly and tighten 
into hole (see Figure 2). 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.

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.

Seal Chamber -

 Set unit on its side with fi ll plug (5) 

downward, remove plug (5) and drain all oil from seal 
chamber. Apply pipe sealant to pressure gauge assembly 
and tighten into hole in bearing bracket (21). Pressurize seal 
chamber to 10 P.S.I. and check for leaks as outlined above.

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 Figure 2, 12 or  
14). Apply pipe thread compound to threads of pipe plug (5) 
then assemble to motor housing (2).

IMPORTANT! - For single phase units, oil level 
should be below capacitor.

Seal Chamber -

 Set unit on its side, with plug (5) 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 
(5) and assemble to bearing bracket (21).

FIGURE 2