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PAGE 34 — BA-SERIES WALK-BEHIND TROWEL— OPERATION AND PARTS MANUAL — REV. #6 (07/06/10)
Figure 48. Hand Clutch Adjustment
11. Carefully lift
the upper trowel assembly
, line up the key-
way on gear box main shaft and insert into spider assembly.
12. Reinstall square head cone point into spider plate and
tighten in place. Tighten jam nut. Use care in making sure
point of set screw engages groove in gear box main shaft.
13. Lubricate all grease points (zerk fittings) with premium
"
Lithum 12"
based grease, conforming to NLG1 Grade #2
consistency.
Testing
1. Place trowel in test area, start engine and test trowel for
smoothness.
2. If trowel bounces has excessive vibration or does not run
smoothly repeat alignment procedure.
Changing a Blade
Whiteman recommends that
all the blades be changed at the
same time
. The machine may wobble or bounce if only some of
the blades are changed at one time.
1. Place the machine on a flat, level surface. Adjust the blade
pitch control to make the blades as flat as possible. Note the
blade orientation on the trowel arm.
Before removing the blades, please note
the orientation of the blade on the trowel
arm.
NOTE
1. Remove the three bolts and lock washers that secure the
blade to the trowel arm. Remove the blade.
2. Using a wire brush, scrape all concrete particles and foreign
debris from the trowel arm.
3. Install the new trowel blade onto the trowel arm. Make sure
blade is installed correctly, maintaining the proper orienta-
tion for direction of rotation
.
4. Reinstall the three bolts and lock washers that secure the
blade to the trowel arm. Tighten all three bolts securely.
5. Repeat steps 1-4 for all remaining blades.
BA-SERIES TROWEL — MAINTENANCE
Hand Clutch Adjustment
Some trowels are equipped with a hand-operated clutch instead
of an automatic centrifugal clutch. Two types of hand clutches
have been installed. Both are belt-tightener type clutches. They
operate by removing
slack
in the V-belt which then transmits
power from the engine to the gearbox.
There are two reasons to adjust the hand clutch: 1) operator
comfort; 2) initial belt stretch and break-in.
The easiest and most simple adjustment is to adjust the clutch
cable housing using the adjustment nut (Figure 48) located on the
clutch lever. Rotating the nut provides either more or less
(depending upon the direction of rotation) clutch engagement.
Hand Clutch Disengagement
1. Start the trowel as outlined in the "
Initial Start-up
" section in
this manual. Move the throttle lever so that the engine is
running about 1/4 to 1/3 of full speed.
2. Grip the trowel handle firmly and carefully engage the clutch
by squeezing the clutch lever toward the handle with your left
hand. After the trowel is stabilized and you feel comfortable
with its operation, use your right hand to adjust the housing
adjustment nut.
3.
Rotating the nut so that it backs out of the lever housing
increases the engagement and also the squeezing force
required to keep it engaged.
Too much squeezing force may cause premature hand
fatigue. Too little squeezing force may cause belt slippage
and premature belt wear. Each operator should experiment
with the adjustment to get the optimum combination of
squeeze force and belt grip.
4. After initial break-in (approximately 8 hours) the above
procedure should be repeated to attain optimum operator
comfort and belt wear.
5.
After considerable belt wear, the adjustments mentioned
above may have a little or no effect on clutch engagement. If
this is the case, the belt should be replaced.