MULTIQUIP CA4HC Whiteman Series Operation Manual page 63

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 Figures 27 and 28:
1 Trowel Arm Round Shaft Section
2 Trowel Arm Hexagonal (Hex) Shaft Section
3 Lever Mounting Slot (Left Arm Shown)
4 Roll Pin Hole
5 Blade Attachment Bolt Hole (One of Three)
6 Flat of Hexagonal Shaft (Top of Arm)
Figure 27. 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 28 item 3) .
1 Trowel Arm
2 Flat Test Surface
3 Feeler Gauge (.004 in. / 0.10 mm)
4 Feeler Gauge (.005 in. / 0.127 mm))
Figure 28. Checking Trowel Arm Flatness
CA4HM WALK-BEHIND TROWEL — OPERATION MANUAL — REV. #3 (10/28/10) — PAGE 27
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 31) 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.
1 Adjustment Bolt
2 "Distance"
3 Locking Nut
4 Fixture Arm
Figure 29. 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 30.
NOTICE
Arms with clockwise blade rotation use the fixture arm in the
UP position (A in Figure 30). Arms with COUNTER CLOCK-
WISE blade rotation use the fixture with the fixture arm in the
DOWN position. (B in Figure 30).
MAINTENANCE
2
3
1
4
SIDE VIEW