Paragraphs 306-308A
ALLIS-CHALMERS
Fig, ACI39'Mocfef CA left unit brake in-
staltation when platform and wheel guard
and support are removed. Brake band can
be removed at this time,
1.
Hairpin locks 5. Toggle pin
2.
Band pivot pin 6. Toggle
3.
Spring 7. Band centering
4.
Ad justing screw washer
Models WD*WD45
The brakes are of the external con-
tracting type. Fig. AC140, with each
brake drum keyed to the inner end of
its bull pinion gear shaft.
306.
To adjust either brake unit turn
screw (18) in until slight drag is ob-
tained when turning wheel; then back
off screw
V2
turn. Turn nut on brake
shoe clevis (6) until slight wheel drag
is obtained, then back off about ^/i
18 ,A\ \ 1 \
t7 V \ 16 15
12
Fig, ACMO-Model WO broke unit. Brake drums are keyed to inner end of each final
drive bull pinion shaft. On late WD tractors, pin (IS) is provided with a
head.
Model
WD45 is similar.
1.
Shoe return spring (rear)
2.
Pin
3.
Drum snap ring
4.
Brake lining .
5.
Pin
6. Clevis
7.
Adjusting bolt
8. Shoe return spring (front)
9. Adjusting toggle pin
10.
Snap ring
11.
Toggles
12.
Snap ring >
13.
TogBle pin
14.
Brake drum
15.
Shoe anchor pin
16.
Anchor pin lock
17.
Brake shoe
18.
Shoe centralizing screw
turn. Do the same to the other brake.
Each brake pull rod should meas-
ure 16 5/16 inches from center line of
hole in brake pedal to front face of
toggle (13). This setting provides best
pedal leverage.
306A. To remove brake shoes, re-
move brake compartment covers. Dis-
connect and remove front and rear
shoe return springs (1 & 8). From low-
er side of transmission housing, re-
move brake shoe anchor pin lock, and
remove anchor pin (15). In the event
that the brake anchor pin cannot be
removed by prying, it may be neces-
sary to drill and tap the anchor pin
so that a suitable puller of the stud
and sleeve type may be used. Remove
adjusting nut from clevis (6). Front
shoe should be removed first, through
compartment cover opening. Remove
rear shoe in like manner.
Reinstall the front shoe, as an as-
sembly made up of the brake shoe,
toggle levers, toggle pin and adjusting
clevis and pin. The large brake shoe
return spring (1) is for the rear shoe
and the smaller spring (8) is used for
the front shoe.
306B.
To remove a brake drum, it
is necessary to first remove its final
drive unit and pull drum off bull pin-
ion shaft as outlined in paragraph 282.
BELT PULLEY and PTO
BELT PULLEY UNIT
G Without Hydraulic Lift
This model is furnished with a belt
pulley unit only, or with a combined
belt pulley and hydraulic lift unit. It
is not furnished with a conventioTial
power
take-off'
Refer to paragraphs
309A and 309B for repair data on mod^
els equipped with hydraulic lift,
308.
COMPLETE ADJUSTMENT.
Both shafts of the unit are carried on
tapered roller bearings which should
be in correct adjustment before at-
tempting to adjust the backlash of the
belt pulley gears. Bearings of both
shafts are considered in correct ad-
justment when the shafts rotate freely
but have zero end play.
308A. To adjust bearings of bevel
pinion shaft (10—Fig. AC145), turn
the nut (2) located under dust cap at
pulley end of shaft. After completing
the adjustment, lock the nut (2) by
staking thin portion of same into the
shaft keyway.
Adjustment of bearings for the bevel
gear shaft (13) is accomplished by re-
moving or adding shims (7) located
under the two bearing retainers.
Belt pulley gears are adjustable for
backlash, but the mesh position is
fixed and non-adjustable. Backlash
3.
Pulley hub
4.
Oil seal
6. Housing
7.
Shims
8. Oil retainer
9. Pulley hub key
10.
Bevel pinion shaft
11.
Snap ring
12.
Bevel gear
13.
Bevel gear shaft
16.
Bearing retainer
19.
Dust cap
Fig, ACT45—Modef 6 belt pulley unit which is supplied for tractors not equipped with
a hydraulic lift system. Recommended backlash of .005-.007 between bevel gear (12)
and pinion (10) is controlled with shims (7) which also control bearings ad\us*ment.
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