Barnes BP31 Series, Installation And Operation Manual, Page: 8 / 18

SECTION D: SERVICE AND REPAIR
WARNING !
ELECTRICAL POWER TO THE PUMP MOTOR MUST BE DISCONNECTED AND LOCKED OUT TO
PREVENT ANY DANGEROUS ELECTRICAL HAZARDS OR PERSONNEL DANGER BEFORE ANY
SERVICE WORK IS DONE TO THE PUMP.
CAUTION!
OPERATING PUMP BUILDS UP HEAT AND PRESSURE; ALLOW TIME FOR PUMP TO COOL TO
ROOM TEMPERATURE BEFORE HANDLING OR SERVICING.
D-1) Lubrication:
Anytime the pump is removed from operation, the cooling oil in the motor housing (5) must be checked visually for
oil level and contamination.
D-1.1) Checking Oil:
To check oil, set unit upright. Remove gland nut on cable (10). With a flashlight, visually inspect the oil in the motor
housing (5) to make sure it is clean, clear and that the oil level is above all internal componentry . If oil appears
satisfactory, replace gland nut. If oil is low or appears contaminated, test oil as per section D-1.2
D-1.2) Testing Oil:
1. Place pump on it’s side, remove gland nut on cable (10) 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 (measures above 15 KV. breakdown), refill the motor housing
as per section D-1.3.
4. If oil is found to be dirty or contaminated (or measures below 15KV. breakdown), then the pump must be
carefully inspected for leaks at the shaft seal (19), cord inlet (10), and lower end bell (15) before
refilling with oil.
D-1.3 Replacing Oil in Motor Housing:
Drain all oil from motor housing and dispose of properly. Refill with new cooling oil as per table 1. An air space must
remain in the top of the motor housing to compensate for air expansion. Set unit upright and fill only until the capacitor,
as viewed through the control cable hole, is covered.
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.
D-2) Bottom Plate:
Remove screws (27), and remove bottom plate (26) from body (20). Clean and examine impeller (23). If impeller
vanes are clogged, or it is excessively worn or broken, the impeller should be replaced. Follow procedures in
Paragraph D-3 for replacing impeller.
8