70 SERIES DRIVE HEAD ASSEMBLY
NO. 25200
The 70 Series Rotex drive head has been carefully designed
to require a minimum of maintenance. All rotating parts are
mounted on anti-friction bearings, and parts which are subject to
wear are designed to be replaceable.
Repair work on the driving mechanism should be done in an
area relatively free of dust. Refer to the exploded drive head
assembly drawings when following the instructions below, and
prior to disassembling the mechanism. When making a complete
overhaul of the driving mechanism, it is generally good practice
to replace all bearings.
REMOVING DRIVE HEAD FROM MACHINE
1. Disconnect the discharge end horizontal drag link from the
box frame.
2. Remove grease fitting and threaded tube assembly (1A+1B)
and dust cover (2).
3. Remove lock wire (3) and eight cap screws (4) from the
clamping sleeve (5).
4. Place three of the removed cap screws in the tapped holes
(not shown on the drawing) provided in the clamping sleeve
(5), and use them as push screws to loosen and remove the
sleeve from the head end plate (6).
5. Remove the belt guard and v-belts. Inspect the v-belts for wear
or deterioration at this time.
6. Lift the box frame assembly up and clear of the drive head.
7. Remove the drive head from the base of the machine after
removing the mounting nuts and bolts.
8. Drain oil by removing drain plug (82) from the housing
assembly (77) and two drain plugs (87) in the pump sump
assembly (84).
DISASSEMBLY OF DRIVE HEAD
CRANKPIN ASSEMBLY REMOVAL
1. Remove lock wire (20) and 12 cap screws (19) and lock washers
(18) from the crankshaft (17) and remove
crankpin assembly.
2. Remove baffle (15A) from the crankshaft.
3. Remove gasket (16) from the crankshaft.
CRANKPIN BEARING REMOVAL
1. Remove flat head screw (15) and crankpin bearing spacer lock
(14) from crankpin bearing housing (9).
2. Remove snap ring (11) from the crankpin.
3. Press the crankpin out of the crankpin bearing (10).
4. Remove felt seal (8) from the crankpin.
5. Press the crankpin bearing from the crankpin bearing housing.
MAINTENANCE INSTRUCTIONS
REMOVAL OF PINION SHAFT ASSEMBLY
1. Remove ROTEX sheave (111), bushing (110), and key (120)
from the pinion shaft (119).
2. Remove the inspection hole plate (94) from the drive head
housing (77) by removing ten cap screws (96) and lock
washers (97). Remove the gasket (95) from the inspection
hole plate (94).
3. Remove the oil seal cap (107) from the drive head housing
by removing the 10 cap screws (109) and lock washers (108).
If the felt seal (102) remains on the pinion shaft, remove and
replace it in the oil seal cap.
4. Remove lock wire (125), seven cap screws (124) and lock
washers (123) in the pinion shaft housing (122).
5. Pull the pinion shaft assembly out of the drive housing. Care
should be taken at this time not to damage the shims (121).
They should be used in reassembly unless new shims are
available. If the pinion shaft assembly does not come out
easily, drive the pinion shaft out of the drive housing by
tapping from the pinion end with a long piece of wood.
DISASSEMBLY OF PINION SHAFT ASSEMBLY
1. Remove cap (101) from pinion shaft housing (122) by
removing lock wire (105) and five cap screws (104) and lock
washers (103).
2. Remove lock nut (100) and lock washer (99) from the
pinion shaft (119).
3. Drive pinion shaft (119) and pinion and inboard bearing
(117) out of the pinion shaft housing (122) by tapping from
the sheave end.
4. Remove lock wire (112), three cap screws (113), lock
washers (114) and bearing clamp plate (115) from the pinion
shaft (119).
5. Remove the beveled pinion (116) from the pinion shaft and
remove key (118).
6. Pull the inboard bearing (117) from the pinion shaft.
7. Pull the outboard bearing (98) out of the pinion shaft
housing (122).
REMOVAL OF CRANKSHAFT ASSEMBLY
1. Remove pump sump assembly (84) by removing 10 cap
screws (86) and lock washers (85).
2. Remove lock wire (76), four cap screws (75) and lock washers
(74), and remove oil pump assembly from the oil pump drive
flange (56).
3. Remove the eight cap screws (31) and lock washers (32) from
the drive head cover (33).
4. By means of the lift yokes on the drive head housing cover, lift
the crankshaft assembly straight up and out of the housing.
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