Service Manual

External Engine Component Repair
Belt Replacement and Adjustment
Governor and Alternator Belt Replacement
1. Loosen idler pulley mounting nut and move pulley to
remove governor belt tension.
2. If removing alternator belt, loosen the two (2) alterna-
tor mounting bolts and pivot alternator to remove belt
tension.
3. Remove two (2) capscrews securing drive shaft cou-
pler to engine crankshaft pulley
, then move drive shaft
out of the way so belt(s) can be removed.
4. Install new belt(s).
5. Install capscrews and washers to secure drive shaft
coupler to engine crankshaft pulley
.
Governor Belt Adjustment
Loosen idler pulley mounting nut, move pulley to in-
crease tension and tighten nut. Check tension by de-
pressing belt at mid span of governor and crankshaft
pulleys with 22 lbs. (10 kg) of force.
A new belt should
deflect .52 – .62 in. (13 – 16 mm) A used belt should de-
flect .62 – .72 in. (16 – 18 mm).
Alternator Belt Adjustment
Using a pry bar, rotate alternator until proper belt tension
is attained, then tighten mounting bolts. Check tension
by depressing belt at mid span of crankshaft and alter-
nator pulleys with 22 lbs. (10 kg) of force. A new
belt
should deflect .3 – .5 in. (8 – 13 mm) A used belt should
deflect .4 – .55 in. (10 – 14 mm).
Fan Belt Replacement
1. Loosen idler pulley nut and move pulley to release
belt tension.
2. Remove belt by carefully moving it around the fan
blades.
3. Install a new belt.
Fan Belt Adjustment
Loosen idler pulley mounting nut, move pulley to in-
crease tension and tighten nut. Check tension by de-
pressing belt at mid span of fan and drive shaft pulleys
with 2
2 lbs. (10 kg) of force. A new belt should deflect .48
– .58 in. (12 – 15 mm). A used belt should deflect .55 –
.65 in. (14 – 17 mm).
2
3
1
4
5
Figure 68
1. Governor belt 4. Alternator brace
2. Alternator belt 5. Drive shaft coupler
3. Idler pulley
1
2
Figure 69
1. Fan belt
2. Idler pulley
Liquid Cooled
Gas Engine
Workman 3000/4000 Series
Page 3 – 47
Liquid Cooled Gas Engine