HHXd5 RIde-ON TROWeL • OpeRaTION maNuaL — Rev. #2 (05/04/12) — page 41
Maintenance
Checking Trowel arm Straightness
Trowel arms can be damaged by rough handling, (such
as dropping the trowel on the pad), or by striking exposed
plumbing, forms, or rebar while in operation. A bent trowel
arm will not allow the trowel to operate in a smooth fluid
rotation. If bent trowel arms are suspect, check for flatness
as follows, refer to Figure 42 and Figure 43:
Figure 42. Trowel Arm
1. Use a thick steel plate, granite slab or any surface
which is true and flat, to check all six sides of each
trowel arm for flatness.
2. Check each of the six sides of the trowel arm (hex
section). A feeler gauge of .004" (0.10 mm) should not
pass between the flat of the trowel arm and the test
surface along its length on the test surface. (Figure 43) .
Figure 43. Checking Trowel Arm Flatness
Lever Mounting Slot
(Left Arm Shown)
Roll Pin Hole
Blade Attachment
Bolt Hole (1 of 3)
Flat of D-Shaft
(Top of Arm)
Trowel Arm
Round Shaft Section
Trowel Arm
D-Shaft Section
Trowel Arm
Flat Test
Surface
Feeler Gauge
(.004 in./0.10mm)
Feeler Gauge
(.005 in./0.127mm)
3. Next, check the clearance between the round shaft and
the test surface as one of the flat hex sections of the
arm rests on the test surface. Rotate the arm to each
of the flat hex sections and check the clearance of the
round shaft. Use a feeler gauge of .005" (0.127 mm).
Each section should have the same clearance between
the round of the trowel arm shaft and the test surface.
4. If the trowel arm is found to be uneven or bent, replace
the trowel arm.
Trowel arm adjustment
Shown in Figure 44 is the adjustment fixture with a trowel
arm inserted. As each trowel arm is locked into the fixture, the
arm bolt is adjusted to where it contacts a stop on the fixture.
This will consistently adjust all of the trowel arms, keeping the
finisher as flat and evenly pitched as possible.
1. Locate the trowel arm adjustment tool P/N 9177.
Figure 44. Trowel Arm Adjustment Tool Side View
2. Ensure the fixture arm is in the proper setting (up or down)
for your trowel arm rotation as shown in Figure 45.
Figure 45. Trowel Arm Adjustment Setup
DISTANCE
LOCKING
NUT
ADJUSTMENT
BOLT
FIXTURE
ARM
SIDE-VIEW
