Champion Compressors Pty. Ltd. Manual No. 975425 Rev. C
64
8.7 Fastener Torques
The following is a list of tightening torques which may be required during
routine service or for repairs to the compressor:
Mild Steel Heat Treated
Bolt Size
Standard
N.m (Ft.lbs)
High Tensile
N.m (Ft.lbs)
Socket Head
N.m (Ft.lbs)
Socket C/Sunk
N.m (Ft.lbs)
M6 4 (3) 9 (7) 20 (15) 9.5 (7)
M8 9.5 (7) 22 (16) 34 (25) 23 (17)
M10 18 (13) 43 (32) 61 (45) 46 (34)
M12 30 (22) 77 (57) 142 (105)
81 (60)
M16 74 (55) 190 (140) 270 (200)
200 (150)
M20 143 (106) 370 (270) 650 (480)
400 (295)
M24 248 (183) 640 (470) 1110 (810)
640 (471)
3/8” UNC 2.3 (27) 3.2 (38) 61.5 (45) 39.6 (29)
1/2” UNC 5.6 (66) 7.8 (92) 147 (109)
96 (71)
8.8 Belt Tension Adjustment
The correct drive belt tension is essential to ensure that full motor power is
transmitted to the airend. The belt tension is achieved by turning the jacking
nut, located above the airend. This will raise the airend which has the effect
of increasing belt tension.
Belt tension must be adjusted five minutes after a new set of belts is fitted
and then again ten minutes later. This will ensure that the belts have
completed their initial stretch. Subsequent to this, belt tension needs to be
checked (and adjusted if appropriate) every 1500 hours for the duration of the
belt life.
8.8.1 Belt Tension Measurement
Belt tension is measured by using a Tensiometer (Champion Part No. 270965
- refer Figure 17 - Belt Tension Adjustment).
Use the following procedure to measure belt tension.
1. Set the large o-ring so that the o-ring bottom is at the 8mm mark.
2. Ensure that the small o-ring is set at the zero mark.
3. Hold the top of the Tensiometer and press it at right angles to the belts,
midway between the airend pulley and motor pulley into one of the vee
belts. When the bottom of the large o-ring is level with the top of the
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