Multiquip HHN34TVD - Manual (Page 37)

HHN34TVD RIDe-ON TROWeL • OpeRaTION maNuaL — ReV. #2 (01/10/11) — page 37
Maintenance
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.
STeeRINg aDJuSTmeNT
The steering assist adjustment should be performed only
by qualified service technicians. For HHN34TVD steering
adjustment instructions, reference MQ Whiteman service
bulletin 200925.
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.
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.
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 (Figure 34).
NOTICE
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.