EHHNK5 RIDE-ON TROWEL • OPERATION MANUAL — REV. #3 (05/03/21) — PAGE 43
2. Remove and set aside the hex head bolt (Zerk fitting)
and roll pin securing the trowel arm to the spider plate.
Figure 43. Zerk Fitting and Roll Pin Removal
3. Remove the trowel arm from the spider plate and set
it aside (Figure 43).
4. If the trowel arm inserts (bronze bushings) come out
with the trowel arm, remove the bushings from the
trowel arm and set them aside. If the bushings remain
inside the spider plate, carefully remove the bushings.
5. Examine the bronze trowel arm bushings (Figure 44),
and clean them if necessary. Replace the bushings if
out-of-round or worn.
Figure 44. Bronze Bushings
6. Wire brush any buildup of concrete from all six sides
of the trowel arm. Repeat steps 2–6 for the remaining
arms.
SPIDER
PLATE
ROLL
PIN
TROWEL
ARM
HEX HEAD BOLT
(ZERK FITTING)
2-PIECE
BRONZE
BUSHINGS
Trowel Arm Inspection
Trowel arms can be damaged by rough handling (such
as dropping the trowel on a pad), or by striking exposed
plumbing, forms, or rebar while in operation. A bent trowel
arm will prevent the blades from rotating in a smooth, fluid
motion. If bent trowel arms are suspected, examine for
straightness as shown below. Refer to Figure 45.
Figure 45. Trowel Arm Inspection
1. Place the trowel arm on a thick steel plate, granite
slab, or any other clean surface which is true and flat.
2. Check each of the six sides of the trowel arm hex
section. A feeler gauge of 0.10 mm (.004 inch) should
not pass between the flat of the trowel arm and the test
surface along its length.
3. Use a feeler gauge of 0.127 mm (.005 inch) to check
the clearance between the round shaft of the trowel
arm and the test surface as one of the flat hex sections
of the arm rests on the test surface. Continue to check
the clearance of the round shaft while rotating the arm
to each of the flat hex sections. The clearance between
the round shaft and the test surface should be identical
each time the hex section is rotated.
4. Replace the trowel arm if it is uneven or bent.
TROWEL ARM
(HEX SECTION)
TROWEL ARM
(ROUND SHAFT)
FLAT
TEST
SURFACE
FEELER GAUGE
(0.10 mm/.004 in.)
FEELER GAUGE
(0.127 mm/.005 in.)
MAINTENANCE (TROWEL)
