MBW MM120 - Manual (Page 15)

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2. Check alignment between the two coupler sprockets.
Sprockets must be parallel and in-line. Adjust drum
location 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. Reassemble the coupling chain and install the con-
necting link.
6. Reinstall the engine shroud.
Drum Bearing & Seals Replacement
Refer to Drum Assembly, page 16.
1. Remove mixing drum from mixer. See Drum
Removal, page 11.
2. Loosen set screws and remove coupling sprocket
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. Torque set screw 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 chain coupler sprocket. Tighten set
screws using a medium strength thread locking
compound.
24. Reinstall mixing drum onto frame. See Drum
Installation, page 11.
Engine & Gearbox Removal
Refer to Gearbox Drivetrain Assembly, page 20.
1. Remove engine shroud before attempting to remove
engine and gearbox. See Engine Shroud Removal,
page 11.
2. Disengage clutch by moving engagement handle into
“IDLE” position.
3. Disassemble connecting link (#15) on chain coupling
and remove chain (#10).
4. Unbolt ball joint from actuator (#12) by removing nut
(#27) and lockwasher (#28).
5. Remove four bolts (#25), washers (#29),
lockwashers (#28), and nuts (#26) holding engine to
frame.
6. Lift engine and gearbox (#14) off of frame by lifting
eye located on clutch housing cover. Approximate
weight is 200 pounds.
Engine & Gearbox Installation
Refer to Gearbox Drivetrain Assembly, page 20.
1. Lower the engine and gearbox onto the mixer frame.
2. Align holes and install bolts (#25), washers (#29),
lockwashers (#28), and nuts (#26) to secure engine.
Do not tighten.
3. Line up both coupling sprockets (#11). If they are out
of vertical alignment, loosen the jam nuts (#31) on the
shock mount (#2) and adjust the height. Retighten
jam nuts.
4. Reassemble coupling chain (#10) to sprockets and
install connecting link (#15).
5. Tighten engine hardware.
6. Bolt ball joint to actuator (#12) using nut (#27) and
lockwasher (#28). If linkage does not fit properly, ad-
just length by loosening both jam nuts and turning
rod. Retighten jam nuts.