MAINTENANCE AND REPAIR
Before attempting any repair work on the unit. be certain the
snapswitch is in the OFF position or the wiring is disconnected
from the line. Blow down the pressure from the receiver and
isolate the unit from any outside source of air pressure. These
simple precautions will prevent accidents.
personnel in inspecting, servicing, repairing and otherwise maintaining
the air compressor. Any special disassembly or reassembly procedures
are described under the appropriate heading.
TORQUE VALUES. We recommend the use of a torque wrench. The following table
gives the torque for tightening the different size cap screws and nuts.
TABLE 5-1. TORQUE VALUES
UNIFIED COARSE
UNIFIED FINE
Dia. Pitch
Ft. Lbs .
Ft. Lbs .
Dia. Pitch
Min.
Max.
Min.
Max.
1/4''-20
6
1/4''-28
7
5
6
14
5/16''-18
12
5/16''-24
10
9
3/8''-16
21
24
3/8'' -24
14
16
1/2''-13
52
59
1/2''-20
40
42
120
105
5/8''-11
5/8''-l8
60
70
3/4''-10
190
170
3/4''-16
100
120
COMPRESSOR LUBRICATION. A non-detergent, napthenic base oil containing a rust
and oxidation inhibitor is recommended. The viscosity should be selected for the temperature
immediately surrounding the unit when it is in operation. The viscosities given in Table 5-2
are intended as a general guide only. Heavy-duty operating conditions require heavier vis-
cosities, and where borderline temperature conditions are encountered, the viscosity index of
the oil should be considered.
