MBW MM121 - Manual (Page 12)

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Drum Installation
Refer to Drum Assembly, page 14.
1. Lower drum onto frame supports. Pillow blocks (#5)
should be snug to trunnions (#8) to eliminate
excessive endplay.
2. Check alignment between the two coupler sprockets.
Sprockets must be parallel and in-line. Adjust drum
location if necessary.
3. Slide mounting bar (#13) into front support tube.
4. Install four bolts (#19), lock washers (#20), and
washers (#21) and tighten.
5. Dump drum to check for binding. If binding is noticed,
loosen bolts and realign pillow blocks.
6. Remove spring pin from the hydraulic cylinder’s top
clevis pin, and pull clevis pin halfway out.
7. Rotate cylinder into engagement with drum and
reinstall clevis pin and spring pin. Check to ensure
that spacer is in place.
8. Reassemble the coupling chain and install the
connecting link.
9. Reinstall the engine shroud.
Drum Bearing & Seals Replacement
Refer to Drum Assembly, page 14.
1. Remove mixing drum from mixer. See Drum
Removal, page 8.
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 (#16) and nuts (#17) 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 collar set screw using medium strength
thread locking compound, 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 chain coupler sprocket. Tighten set
screws using a medium strength thread locking
compound.
24. Reinstall mixing drum onto frame. SeeDrum
Installation, page 9.
Valve Handle Replacement
1. To replace motor (right) handle, pull motor handle
forward to lock into detent. To replace cylinder (left)
handle, push motor handle back and hold in place
with rope or bungee.
2. Loosen jam nut, and unthread handle from valve
block.
3. Install new handle and tighten jam nut.
Pump Coupler Replacement
Refer to Engine Assembly, page 20.
1. Remove engine shroud.
2. Pry the inspection cover off of the pump-to-engine
adapter (#7 or 12). Visually inspect the coupler insert
(#10) to determine if replacement is needed.
3. Remove four bolts, washers, lock washers, and nuts
securing engine to frame, and slide engine back.
4. Remove two screws (#17) and lock washers (#18)
holding pump (#6 or 14) to adapter.
5. Pull pump off of adapter far enough to remove
coupler insert, and install new one.
6. Insert pump into adapter and bolt in place.
7. Bolt engine to frame in original position.