WALK BEHIND POWER TROWEL INSTRUCTION MANUAL
The trowel arm adjustment fixture (20801) is reversible.
By rotating the arm clamping fixture and the ring bolt,
both left hand and right hand trowel arms may be
adjusted. Before attempting adjustment, determine
whether the trowel arm is right handed or left handed.
When adjusting left hand trowel arms use the side of the
fixture marked “L”. When adjusting right hand trowels
arms use the opposite side. The adjustment bar will be
set on “36” for the Walk-behind trowel arm.
ADJUSTMENT PROCEDURE
1. Remove all trowel arm assemblies (1 & 2 arm and
attached lift lever) from suspected maladjusted spider
plate.
2. Remove lift lever (2) from trowel arm (1) by first
loosening jam nut (3) then square head screw (4). If
upon inspection (method left to discretion of
serviceman) any trowel arm (1) is found to be in a
bent condition, it must either be brought back to its
original straight condition (method left to the
serviceman’s discretion) or replaced with new part.
3. Replace lift levers (2) on new or straightened arms
(1) by reversing procedure as described above.
4. Place trowel arm assembly (1 and 2) in fixture (5)
with lift lever (2) butting up against fixture. Clamp in
place with bolts (6).
5. Loosen locknut (7) and screw carriage bolt (8) down
to full depth allowable. This will provide for ample
clearance to swing precision ground adjustment bar
(9) over head of carriage bolt.
Adjustment bar (9) is stamped for appropriate size of
machine. Swing appropriate side directly over carriage
bolt (8) and secure in place with bolt (10).
6. Adjust carriage bolt (8) upwards until contact is made
with adjustment bar (9); holding carriage bolt in
position with one wrench, tighten locknut (7) to secure
in position with second wrench.
7. This same procedure is to be followed with ALL arms
from spider plate assembly, and will ensure correct
and exact adjustment.
TROWEL ARM ADJUSTMENT SCREW
The trowel arm adjustment screw is to be used for field
adjustment of blade level, in the event of a damaged
trowel arm, to enable completion of the job. At the end of
the job repairs should be made to eliminate the damage.
When assembling trowel blades to trowel arms, the
adjustment screw should NEVER protrude below the
under-side surface of a trowel arm.
If the adjustment screw is not flush with the underside of
the trowel arm, then this will cause the power trowel to
bounce and vibrate especially at high speed. This will
also cause the trowel blades to leave an uneven finish to
the concrete due to the blades not being level to one
another.
Make certain that the adjusting screw is held firmly in
place while tightening the bolt which secures the blade to
the trowel arm.
17
375 ANNAGEM BLVD., MISSISSAUGA, ONTARIO, CANADA L5T 3A7, 905-364-4200 FAX 905-364-4201
CREATED: 07/04
REVISED: 05/10
TROWEL ARM ADJUSTMENT FIXTURE
PART #20801
Ex: Unit 36” (B436)
1)
10810A – Trowel arm
2)
10817A – Lift lever
3)
10808 – Jam nut
4)
10809 – Set screw
5)
10824 – Block top
6)
10507 – Bolt
7)
10808 – Jam nut
8)
10807 – Carriage bolt
9)
10832 – Adjustment bar
10)
10507 – Bolt
Figure 5a.
NOTE: IT IS IMPORTANT THAT WHEN TIGHT -
ENING SQUARE HEAD NUT (4), IT SEATS ITSELF
SECURELY INTO DIMPLE MACHINED IN ARM.
NOTE: IT IS VITALLY IMPO RTANT TO ENSURE
THAT ONCE THE CARRIAGE BOLT IS ADJUSTED
TO THE CORRECT HEIGHT, IT DOES NOT MOVE
BEFORE, OR DURING THE TIGHTENING OF
LOCKNUT.
CREATED: 06/12
18
Part Number Description
Qty. Part Number Description
Qty.
21805
Mounting Plate
1
11667
Flat Washer
8
11615
Nut
8
10104
Spacer
4
11614
Lock Washer
8
10452
Bolt
4
MOUNTING PLATE ASSEMBLY (BM90/BM436)
GEARBOX ASSEMBLY (BM90/BM436)
Part Number Description
Qty. Part Number Description
Qty.
21779
21786
Bearing
1
21780
21787
Bearing
1
21734
Pressure Washer
1
21788
Oil Seal
1
21735
Flat Head Screw, Main Shaft
1
21789
Key
1
21781
Bronze Gear
1
21790
Key
1
21782
Main Shaft
1
21747
Plug
2
21783
Left Bearing Flange
1
21748
Key
1
21784
Counter Shaft
1
21749
Oil Seal
1
21785
Right Bearing Flange
1
21791
Oil Seal
1
21736
Pressure Release Valve
1
21792
Bearing
1
21742
Screw
16
21764
Jam Nut
1
21743
Bolt
4
21793
Stud
1
11622
Nut
5
21794
Bearing
1
11621
Lock Washer
5
21750
Glass Eye
1
41516
Washer
5
Part Number Description
Qty. Part Number Description
Qty.
14270
Pulley (GX160)
1
14285
Pulley (GX270)
1
13714
Belt (GX160)
1
14285
Belt (GX270)
1
21795
Belt Guard Assembly
1
CLUTCH ASSEMBLY - GX270 (BM90/BM436)
Part Number Description
Qty.
11021
Spindle
1
21022
Drum
1
11026
Face Plate
1
11025
Weight
1
11020
Bearing
1
10206
Key
1
11024
Spring
1
11256
Lock Washer
2
