SERViCE MANUAL
Paragraphs 102-103
front support to prevent tipping. Unbolt clutch hous-
ing from engine and move front half of tractor
forward.
Unbolt and remove pressure plate assembly and re-
move clutch friction
disc.
Inspect the friction disc and
if pads are worn to a point where there is less than
0.010 inch (0.24 mm) of material above rivet heads,
renew the disc. Inspect pressure plate for grooving
and flatness. If plate is grooved more than 0.025 inch
(0.64 mm) or if face is worn out-of-flat more than
0.006 inch (0.152 mm), renew pressure plate. Do not
reface a worn pressure plate.
When reinstalling, reverse removal procedure.
Clutch friction disc is marked FLYWHEEL SIDE for
correct installation. Adjust clutch pedal height as out-
lined in paragraph 97 or 98.
Fig. 84—Expioded view of 11 inch (279 mm) Laycock
clutch. Four pad dutch disc is used on Modei 385. Six
pad dutch disc is used on Models 485 and 585.
1.
Clutch disc (385)
lA. Clutch disc (485
& 585)
2.
Pressure plate
3.
Cover
Spring cup
6.
7.
8.
9.
10.
5.
Spring
Finger
Spring clip
Cap screw
Nut
Wear clip
11.
Pin
Fig. 85—Expioded view of 12 inch (305 mm) Rockford
dutch used on Modeis 685 and 885.
1.
Clutch disc
2.
Pressure plate 8. Finger
3.
Spring seat 9. Cap screw
4.
Insulating washer 10. Washer
5.
Spring 11. Finger tension
6. Spring cup spring
7.
Cover 12. Pin
TWO SPEED POWER SHIFT
OPERATION
REGULATOR (CONTROL) VALVE
Modeis So Equipped
102.
All models may be equipped with a two speed
Power Shift unit located in front of the speed trans-
mission. The two speed unit is controlled by an elec-
tric solenoid/hydraulic valve. The two position con-
trol switch is located on left side of instmment panel.
When shifted from high (direct) drive to low drive,
tractor power is increased with a 17 percent reduc-
tion in speed in any tractor gear without interrup-
tion of engine power. This gives the tractor a total
of sixteen forward speeds and eight reverse speeds.
Modeis So Equipped
103.
R&R AND OVERHAUL. The regulator (con-
trol) valve (4—Fig. 86) and bottom core plate (12) can
be removed from tractor without removing the speed
gearbox. All other service on the Power Shift unit re-
quires removal of complete speed gearbox.
Ib remove the regulator valve and bottom core
plate, first disconnect battery ground cable. Remove
drain plug and drain transmission fluid. On models
equipped with front drive axle, unbolt and remove
drive shaft shield and front drive shaft. On all models.
57
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