Engine Equipment
pressure plate. Then, while holding the clutch drive
shaft to prevent the clutch from turning, turn the
clutch adjusting ring clockwise as shown in Fig. 14
and tighten the clutch until the desired pressure on the
outer end of the hand lever, or at the clutch release
shaft (Fig. 16), is obtained as shown in Table 1.
6. Install the clutch adjusting ring spring lock on the
8" and 11-1/7" diameter clutches. The ends of the
lock must engage the notches in the adjusting ring. On
the 14" diameter clutch. reinstall the end of the
adjusting ring lock in one of the splined grooves in the
hub of the outer pressure plate. Then install the
inspection hole cover.
Adjust the 18" diameter clutch as follows:
1. Rotate the clutch, if necessary, to bring the
Adjustment lock and the pinion within reach through
the inspection hole.
Fig. 16 - Checking Power Take-Off Clutch
Adjustment with Torque Wrench and Adaptor
2. Loosen the lock bolt and pull the lock out of mesh
with the adjusting ring; then, tighten the lock bolt to
hold the lock out of the adjusting ring. While holding
Pressure
Hand Lever
Torque
Clutch
the clutch drive shaft to prevent the clutch from
psi
Nm
lb-ft
kPa
Length
Dia.
turning, turn the adjustment pinion clockwise to
tighten the clutch as shown in Fig. 15.
76-85
8"
40
276
56-63
20"
3. Loosen the lock bolt and move the lock so it will
448
94-100
127-36
65
11-12"
20"
mesh with the teeth of the adjusting ring, then tighten
the lock bolt.
517
132-149
179-202
14"
75
25"
When properly adjusted, the approximate pressure
278-298 379-404
90
621
18"
40-3/8"
required at the outer end of the hand lever to engage
the various diameter clutches is shown in the table.
These specifications apply only with the hand lever
TABLE 1
which is furnished with the power take-off.
A suitable spring scale may be used to check the
pounds pressure required to engage the clutch.
However, a more accurate method of checking the
clutch adjustment is with a torque wrench as shown in
Fig. 16.
To fabricate an adaptor, saw the serrated end off of a
clutch hand lever and weld a 1-1/8" nut (across the
hex) on it as shown in Fig. 16. Then saw a slot
through the nut.
When checking the clutch adjustment with a torque
wrench, engage the clutch slowly and note the amount
of torque immediately before the clutch engages (goes
over center). The specified torque is shown in Table I.
The facings of the clutch discs wear only along the
area where they contact the pressure plates during
engagement. The area on each side of the disc beyond
the pressure plates does not wear proportionately, thus
Fig. 15 - Power Take-Off Assembly Showing
resulting in a ridge. This ridge on three segment
Method of Adjusting 18 Inch Diameter Clutch
clutches can complicate t h e job of making an
adjustment inasmuch as the top segment tends to drop
Page 48
