47MAINTENANCE
6.2 GENERAL MAINTENANCE SAFETY
WARNING! Never assume a compressor is safe to work on just because it is not operating. It could restart at any time.
WARNING! Do not allow oil to accumulate on, in or around acoustic noise material. Immediately replace any oil-
soaked material aer cleaning enclosure surface with nonammable solvent.
WARNING! Do not substitute bolts with material or markings dierent from the original equipment.
CAUTION! Do not over-tighten any bolt, nut tting, connection or spin-on lter element.
CAUTION! Perform repairs and maintenance only in clean, dry conditions in a well-lit and ventilated area.
CAUTION! Clean up any spilled oil or oil leakage and repair oil leaks as soon as they are discovered.
6.3 STOPPING FOR MAINTENANCE
The following procedures should be followed before doing any maintenance on the compressor and will not
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6.4 BOLT TORQUE GUIDELINES
6.4.1 INCH FASTENERS
Inch Fasteners Torque
Size
Dry Oiled Dry Oiled
1
⁄4–20 8 6 12 9
5
⁄16–18 17 13 25 18
3
⁄8 –16 30 23 45 35
7
⁄16–14 50 35 70 55
1
⁄2 –13 75 55 110 80
9
⁄16–12 110 80 150 110
5
⁄8 –11 150 110 220 170
3
⁄4–10 260 200 380 280
6.4.2 BOLT TORQUE FACTORS
Lubricant or Plating Torque Changes
Oil Reduce torque 15% to 25%
Dry lm (Teon or moly based) Reduce torque 50%
Dry wax (Cetyl alcohol) Reduce torque 50%
Chrome plating No change
Cadmium plating Reduce torque 25%
Zinc plating Reduce torque 15%
6.4.3 BOLT TORQUE STAGES
Stage Torque
1st 20-25 /lbs
2nd 55-60 /lbs
3rd 85-95 /lbs
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