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PAGE 22 — HTH44T • RIDE-ON POWER TROWEL — OPERATION AND PARTS MANUAL — REV. #8 (03/27/12)
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HTH44T— MAINTENANCE
Changing A Blade
Whiteman recommends that all the blades on the entire
machine be changed at the same time. If only one or some of
the blades are changed at one time, 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. Affix the bolts and lock washers.
6. Repeat steps 2-5 for all remaining blades.
The easiest and most consistent way to make this adjustment
is to use the Trowel Arm Adjustment Fixture (P.N. 9177) that is
manufactured by Whiteman. This fixture will allow consistent
adjustment of the trowel arm fingers. It comes with all the
hardware necessary to properly accomplish this maintenance
and instructions on how to properly utilize this tool. Adjusting
the trowel arm fingers without a fixture requires a special talent.
If a trowel arm adjustment fixture is not available and immediate
adjustment is necessary; we suggest the following procedure.
If you can see or feel which blade is pulling harder, adjust the
bolt that corresponds to that blade. Another way to determine
which blades need adjustment is to place the machine on a
flat surface and pitch the blades as flat as possible. Now, look
at the adjustment bolts. They should all barely make contact
with the lower wear plate on the spider. If you can see that
one of them is not making contact; some adjustment will be
necessary.
It will be possible to 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 that after adjustment, the blades
pitch correctly. Often times, if the blades are incorrectly
adjusted, they will not be able to pitch flat. This occurs when
the adjusting bolts have been raised too high. Conversely,
sometimes the adjusting bolts are too low and the blades
cannot be pitched high enough for finishing operations.