BLACKMER HD942A, Installation, Operation And Maintenance Instructions

Page: 13 / 28

MAINTENANCE
CB9A-030 page 13/28
CRANKCASE LUBRICATION
Change the crankcase oil every 1,000 hours or 180
days, whichever is shorter. Under severe dusty or
sandy operating conditions, the oil should be changed
every 500 hours or every 90 days
A high quality non-detergent oil is recommended. The
oil used should be of high quality such as API
grade SF, SG, SH or similar.
API grade SA, SB, SC or similar oils should never
be used. Recycled oils should never be used.
Consult factory for special lubricating requirements.
Models Quarts Liters
HD942A / HDL942A 7 6.62
Table 8 - Oil Capacity
Air Temperature SAE ISO Grade
Below 0
°
F (-18
°
C)
0 to 32
°
F (-18 to 0
°
C)
32 to 80
°
F (0 to 27
°
C)
80
°
F (27
°
C) and above
5W
10W
20W
30W
15
22
46
100
Table 9 - Oil Viscosity
Before changing the oil, bring the compressor up to
normal operating temperature. Remove the crankcase
drain plug and drain the oil into an adequately sized
container. Remove the oil pickup screen and clean in a
suitable solvent. When reinstalling the pickup screen,
inspect the metal gasket and the O-ring for damage,
replacing as necessary. If equipped, replace the
external oil filter. See Figure 6.
Refill the crankcase via the dipstick opening.
DO NOT
OVERFILL THE CRANKCASE!
The oil pump on these models will operate in either
direction of crankshaft rotation.
SETTING THE OIL PRESSURE
(see Figure 6)
1. The oil pressure should be about 25 psig
(1.73 Bar).
2. Loosen the locknut.
3. Increase the pressure setting by turning the
adjusting screw inward, CLOCKWISE.
Decrease the pressure setting by turning the
adjusting screw outward, COUNTER-CLOCKWISE.
4. Retighten the locknut.
Figure 6 - Compressor Lubrication System