Stow STR36SP manual Checking Trowel Arm Straightness, Trowel Arm Adjustment

STR36SP-SERIES — 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. Ifbenttrowelarmsaresuspect, check for flatness as follows, refer to Figures 34 and 35.

1Trowel Arm Round Shaft Section

2Trowel Arm Hexagonal (Hex) Shaft Section

3Lever Mounting Slot (Left Arm Shown)

4Roll Pin Hole

5Blade Attachment Bolt Hole (One of Three)

6Flat of Hexagonal Shaft (Top of Arm)

Figure 34. 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 35, Item 3) .

3.Next, check the clearance between the round shaft and the testsurfaceasoneoftheflathexsectionsofthearmrestson thetestsurface. Rotatethearmtoeachoftheflathexsections 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 trowelarm.

Trowel Arm Adjustment

Shown in (Figure 38, Page 37) 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

3

2

4

SIDEVIEW

1Adjustment Bolt

2"Distance"

3Locking Nut

4Fixture Arm

Figure 36. Trowel Arm Adjustment Tool Side View

2.Ensurethefixturearmisinthepropersetting(upordown)for your trowel arm rotation as shown in Figure 37.

1	Trowel Arm		Arms with CLOCK-WISE blade
2	Flat Test Surface		rotation use the fixture arm in the UP
		NOTE	position (A in Figure 37). Arms with
3	Feeler Gauge (.004 in. / 0.10 mm)
			COUNTER CLOCK-WISE blade
4	Feeler Gauge (.005 in. / 0.127 mm))
			rotation use the fixture with the fixture

Figure 35. Checking Trowel Arm Flatness	armintheDOWNposition.(BinFigure
	37).

STR36SP-SERIES • RIDE-ON POWER TROWEL — OPERATION AND PARTS MANUAL — REV. #1 (09/16/11) — PAGE 34