MBW MM90 - Manual (Page 14)

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2. Check alignment between bull gear and pinion.
Gears must be parallel and in-line. Adjust drum loca-
tion if necessary.
3. Bolt pillow blocks to frame using four bolts (#25),
washers (#28 & #10), lockwashers (#27), and lock-
nuts (#26).
4. Dump drum to check for binding. If binding is noticed,
loosen bolts and realign pillow blocks.
5. Loosen intermediate shaft bolts and fine tune gear
alignment if necessary. Set backlash in gears to
0.010” before tightening. NOTE: It may be necessary
to re-adjust alignment of drum or engine so that both
sheaves line up properly.
6. Reinstall the engine shroud.
Drum Bearing & Seals Replacement
Refer to Drum Assembly, page 14.
1. Remove mixing drum from mixer. See Drum
Removal, page 10.
2. Loosen set screws and remove bull gear from main
shaft. Use a puller if necessary.
3. Slide pillow blocks (#5) off of trunnions (#8).
4. Loosen set screw and remove locking collars from
trunnion bearings (#4) by rotating the collars against
the mixing direction of the paddles.
5. Remove four bolts (#19) and nuts (#22) holding each
trunnion to the drum.
6. While supporting the main shaft, slide the trunnion off
of each end.
7. Pull the triple seal kit (#9) out of the back side of each
trunnion and discard.
8. Remove the retaining ring (#7) from each trunnion.
9. Remove the ball bearing and grease shield (steel
washer) from the front side of each trunnion.
10. Inspect the bearings, and replace both if needed.
11. Thoroughly clean all grease from the trunnions.
12. Apply a medium strength thread locking compound to
each outer bearing surface and reinstall the bearings
and grease shields into the trunnions.
13. Reinstall the retaining rings.
14. Install new seal kits into the back side of each
trunnion in the following order: Steel Washer, Soft
Black Seal, Steel Washer, Soft Black Seal, Steel
Washer, Hard Red Seal.
15. Slide trunnions onto each shaft end and bolt in place.
16. Slide bearing locking collar onto front shaft end and
align shaft flush with collar.
17. Lock collar in place by driving in the mixing direction.
18. Tighten set screw using a medium strength thread
locking compound and torque to 20 ft. lbs.
19. Repeat process for rear bearing.
20. Begin pumping grease into trunnion cavity while
rotating main shaft back and forth. NOTE: If grease
comes out through ball bearing seals, check that
grease shield (steel washer) is installed and that
bearing is fully seated in trunnion and cannot move.
21. Continue pumping grease until drum seals “pop out”
into drum. Clean any excess grease from inside
drum.
22. Slide pillow blocks onto trunnions and grease until a
film of grease is seen all around the trunnion.
23. Reinstall the bull gear. Tighten set screws using a
medium strength thread locking compound.
24. Reinstall mixing drum onto frame. See Drum
Installation, page 10.
Engine Removal
Refer to Drivetrain Assembly, page 16.
1. Disengage mixer by moving engagement handle to
“IDLE” position.
2. Disconnect wiring harness (#18) from engine by un-
screwing ring terminal from engine and unplugging
bullet connector.
3. Remove four bolts, washers, lockwashers, and nuts
holding engine to frame.
4. Tilt engine and remove drive belts.
5. Lift engine off of frame.
Engine Installation
Refer to Drivetrain Assembly, page 16.
1. Set engine onto frame and line up with holes.
2. Disengage idler by moving engagement handle to
“IDLE” position and install both drive belts.
3. Install four bolts, washers, lockwashers, and nuts to
secure engine. Check for proper alignment between
both sheaves (#4 & #5) with a straightedge before
tightening hardware.
4. Connect wiring harness (#18) to engine by grounding
the ring terminal to the engine and inserting the bullet
connector into the splice terminal.