Table 7-2. Preventive Maintenance Checks and Services for Compressed Air System (Continued)
Q - Quarterly
S - Semiannually
A - Annually
CHECK FOR AND HAVE
IS NOT READY/
REPAIRED OR ADJUSTED
B D A D W M Q S A
(c) Remove belt guard from compres-
sor by unscrewing three bolts
(two have spinlock nuts). Place
bolts, washers and nuts with
guard and place where it will not
(d) With two V-belts exposed, check
appearance for frayed, worn, or
extra hard and shiny edges or
breaks in underneath side of belts.
If belts show these signs, belts
must be replaced in pairs in accor-
dance with procedures in para-
graph 1, above. If belts are in
acceptable condition, proceed
with belt alignment/tension check.
(e) With torque wrench, check tight-
ness of bolt holding compressor
shaft. Torque to 500 in-lb.
(f) With normal wrench, check tight-
ness of setscrew holding pulley on
electric motor shaft. Setscrew
must be wrench tight.
(g) Lay a straight edge across top of
belts from compressor pulley to
electric motor pulley and press
down on belts with a thumb. Belts
should depress between ¼ and
½ in. If belts depress more than
this, loosen four bolts holding
motor to base plate and move
motor away from compressor until
belts are within tolerances.
Tighten motor bolts, check belt
tension, and then check belt align-
ment. If all are acceptable, tighten
motor bolts wrench tight.
(h) Install belt guard using three bolts,
spinnuts, and washers.