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HHXD5 RIDE-ON TROWEL • OPERATION MANUAL — REV. #2 (05/04/12) — PAGE 39
MAINTENANCE
TROWEL ARM ADJUSTMENT
Use the following procedure to check and adjust trowel
arms, and check for worn or damaged components when
it becomes apparent that the trowel is finishing poorly or
in need of routine maintenance.
Look for the following indications. Trowel arm alignment,
worn spider bushings or bent trowel arms may the cause.
Are blades wearing unevenly? Is one blade completely
worn out while the others look new?
Does the machine have a perceptible rolling or bouncing
motion when in use?
Look at the machine while it is running; do the guard
rings “rock up and down” relative to the ground?
1. Place the trowel in a FLAT, LEVEL area.
A level, clean area to test the trowel prior to and after is
essential. Any unlevel spots in the floor or debris under the
trowel blades will give an incorrect perception of adjustment.
Ideally, a 5 x 5 Ft. (1.5 x 1.5 Meter) three-quarter inch (19
mm) thick FLAT steel plate should be used for testing.
2. 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 is not making contact,
adjustment will be necessary. (Figure 35).
Figure 35 illustrates, "incorrect alignment", worn spider
bushings or bent trowel arms. Check that the adjustment
bolt is barely touching (0.10" max. clearance) lower wear
plate. All alignment bolts should be spaced the same
distance from the lower wear plate.
Figure 35. Incorrect Spider Plate Alignment
Adjustment Bolt
Surface
Dished Effect on
Finished Concrete
Lower Wear Plate
Figure 36 illustrates the "correct alignment " for a spider
plate (as shipped from the factory).
Figure 36. Correct Spider Plate Alignment
Spider Removal
Remove the spider assembly from the gearbox shaft as
follows:
1. Locate the cone point square head set screw (Figure
37) and attached jam nut found on the side of the spider
assembly.
Figure 37. Spider/Gearbox Removal
Surface
Gearbox
Correct Alignment
Trowel Arm
Mounting Bar
Blade
Gearbox Shaft
Upper Wear Plate
Thrust Collar
Bearing
Thrust Collar
Thrust Collar Bushing
Lower Wear Plate
Jam Nut
Spider Plate
Square Head)
Set Screw (Cone Point,
Gearbox