PAGE 40 — EHHNK5 RIDE-ON TROWEL • OPERATION MANUAL — REV. #3 (05/03/21)
MAINTENANCE (TROWEL)
4. Apply a thin coat of RTV silicone to the mating
surfaces of the CV joint and left-side gearbox coupler
(Figure 36).
Figure 36. RTV Silicone Application
5. Reconnect the CV joint to the left-side gearbox
coupler and lower drive pulley coupler. Secure with
the hardware that was removed earlier.
6. Reinstall the rear panel onto the frame. Secure with
the hardware that was removed earlier.
Trowel Blades
Blade Pitch Adjustment
Perform maintenance adjustment of blade pitch using a
bolt on the trowel arm lever (Figure 37). This bolt is the
contact point of the trowel arm with the lower wear plate
on the thrust collar. The goal of adjustment is consistent
blade pitch and finishing quality.
Figure 37. Blade Pitch Adjustment Bolt
APPLY SILICONE
TO MATING SURFACES
RTV
SILICONE
RTV
SILICONE
GEARBOX
COUPLER
CV JOINT
LEFT-SIDE
GEARBOX
SPIDER PLATE
TROWEL ARM
LEVER
TROWEL ARM
BLADE PITCH
ADJUSTMENT BOLT
If blades are wearing unevenly, adjustment may be
necessary. Look for the following indications.
Is one blade completely worn out while the others look
new?
Does the machine have a perceptible rolling or bouncing
motion while in use?
Do the guard rings rock up and down while the machine
is in use?
Do the pitch control towers rock back and forth while the
machine is in use?
The easiest and most consistent way to make adjustments
to the trowel arm fingers is with the trowel arm adjustment
tool (P/N 9177). It comes with all the hardware necessary
to perform this maintenance and instructions on how to
use this tool.
If a trowel arm adjustment tool is not available and immediate
adjustment is necessary, temporary field adjustment can
be made by adjusting whichever bolt corresponds to the
blade that is pulling harder.
To determine which blades need adjustment, place the
trowel on a clean,
flat
surface. Ideally, a 5' × 5', 3/4" thick,
flat, steel plate should be used for testing. 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 of them does not make visible contact, adjustment is
necessary.
If possible, adjust the “low” bolt to match the level of the
higher bolts. This is the fastest method of adjustment, but
may not always work. If it doesn’t, instead adjust the “high”
bolts to match the level of the bolt that is not making contact
with the wear plate. Verify the blades pitch correctly after
adjustment.
Blades with adjusting bolts that are raised too high often will
not pitch flat. Conversely, blades with adjusting bolts that are
too low will not pitch high enough for finishing operations.
If the trowel still finishes poorly after blade pitch adjustments
have been made, blades, trowel arms, and trowel arm
bushings should be inspected for improper adjustment,
wear, or damage. Refer to the following sections.
