Maintenance - MULTIQUIP J-36 Operation And Parts Manual

Adjust the "high" bolts down to the level of the one that is not
touching, or adjust the "low" bolt up to the level of the higher
ones. If possible, adjust the low bolt up to the level of the rest of
the bolts. This is the fastest way, but may not always work. Verify
after adjustment the blades pitch correctly.
Blades that are incorrectly adjusted often will not be able to pitch
flat. This can occur if the adjusting bolts are raised too high.
Conversely, adjusting bolts that are too low will not allow the
blades to be pitched high enough for finishing operations.
If, after making Blade Pitch adjustments the machine is still
finishing poorly, blades, trowel arms, and trowel arm bushings
may be suspect and should be looked at for adjustment, wear, or
damage. See the following sections.
Changing Blades
It is recommended that ALL the blades on the entire machine
are changed at the same time. If only one or some of the blades
are changed, the machine will not finish concrete consistently
and the machine may wobble or bounce.
1. Place the machine on a flat, level surface. Adjust the blade
pitch control to make the blades as flat as possible. Note
the blade orientation on the trowel arm. This is important
for ride-on trowels as the two sets of blades counter-rotate.
Lift the machine up, placing blocks under the main guard
ring to support it.
2. Remove the bolts and lock washers on the trowel arm, and
then remove the blade.
3. Scrape all concrete and debris from the trowel arm. This is
important to properly seat the new blade.
4. Install the new blade, maintaining the proper orientation
for direction of rotation.
5. Reinstall the bolts and lock washers.
6. Repeat steps 2-5 for all remaining blades.
Clean-Up
Never allow concrete to harden on the power trowel. Immediately
after use wash any concrete off the trowel with water, be careful
not to spray a hot engine or muffler. An old paint brush or broom
may help loosen any concrete that has started to harden.
PAGE 32 — J-36/M-30 WALK-BEHIND TROWEL — OPERATION AND PARTS MANUAL — REV. #0 (12/29/06)
J-36/M-30 TROWEL — MAINTENANCE
Trowel Arm Adjustment
Use the following procedure to check and adjust trowel arms,
and check for worn or damaged components when it becomes
apparent that the trowel is finishing poorly or in need of routine

maintenance.

Look for the following indications. Trowel arm alignment, worn
spider bushings or bent trowel arms may the cause.
■
Are blades wearing unevenly? Is one blade completely
worn out while the others look new?
■ Does the machine have a perceptible rolling or bouncing
motion when in use?
■ Look at the machine while it is running; do the guard rings
"rock up and down" relative to the ground?
1. Place the trowel in a FLAT, LEVEL area.
A level , clean area to test the trowel prior to and after is essential.
Any unlevel spots in the floor or debris under the trowel blades
will give an incorrect perception of adjustment. Ideally, a 5 x 5 Ft.
(1.5 x 1.5 Meter) three-quarter inch (19 mm) thick FLAT steel
plate should be used for testing.
2. Pitch the blades as flat as possible. The adjustment bolts
should all barely make contact with the lower wear plate on
the spider. If one is not making contact, adjustment will be
necessary. (Item 1, Figure 39).
Figure 39 illustrates, " incorrect alignment", worn spider
bushings or bent trowel arms . Check that the adjustment bolt
is barely touching (0.10" max. clearance) lower wear plate. All
alignment bolts should be spaced the same distance from the
lower wear plate.
4
Ttt
1
2
3
4
Figure 39. Incorrect Spider Plate Alignment
Figure 40 illustrates the " correct alignment " for a spider plate
(as shipped from the factory).
1
3
Adjustment Bolt
Lower Wear Plate
Surface
"Dished" Effect on Finished Concrete
2