J36/B46-M30 SERIES WALK-BEHIND TROWELS • OPERATION MANUAL — REV. #1 (11/17/17) — PAGE 41
2. Pitch the blades as flat as possible (Figure 60).
The pitch adjustment bolts should barely contact
(0.10 inch maximum clearance) the lower wear plate.
All adjustment bolts should be spaced the same
distance from the lower wear plate. If any one of the
bolts does not make contact, adjustment is necessary.
Figure 60. Blades Pitched Flat (Correct)
3. Adjust the “high” bolts down to the level of the bolt
that is not touching, or adjust the “low” bolt up to the
level of the higher ones. Whenever possible, adjust the
“low” bolt up to the level of the rest of the bolts. This is
the fastest method, but it may not always work. After
adjustment, verify that the blades pitch correctly.
4. If the trowel still finishes poorly after blade pitch
adjustment has been performed, blades, trowel
arms, and trowel arm bushings may be suspect, and
should be inspected for improper adjustment, wear,
or damage.
Figure 61 illustrates incorrect spider plate alignment due
to improper adjustment, worn spider bushings, or bent
trowel arms.
GEARBOX
BLADE
TROWEL
ARM
MOUNTING
BAR
LOWER
WEAR PLATE
PITCH
ADJUSTMENT
BOLT
STEEL TEST
SURFACE
NOTICE
Incorrectly adjusted blades will often be unable to pitch
flat. This can occur if the adjustment bolts are raised
too high. Conversely, adjustment bolts that are too low
will prevent the blades from being pitched high enough
for finishing operations.
MAINTENANCE
Figure 61. Blades Pitched Flat (Incorrect)
Spider Removal
Refer to Figure 62.
Figure 62. Spider Removal
1. Locate and loosen the cone point square head set
screw and attached jam nut on the side of the spider
assembly.
2. Carefully lift the upper trowel/gearbox assembly off of
the spider assembly. A light tap with a rubber mallet
may be necessary to dislodge the spider from the main
shaft of the gearbox.
NO
LOWER
WEAR PLATE
ADJUSTMENT
BOLT
“DISHED” EFFECT ON
FINISHED CONCRETE
GEARBOX
GEARBOX
SHAFT
THRUST COLLAR
BEARING
THRUST COLLAR
WITH BUSHING
LOWER
WEAR PLATE
SPIDER
PLATE
WEAR RING
YOKE
ARM
JAM NUT
CONE POINT
SQUARE HEAD
SET SCREW
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