Section Contents
8.5
BEST BY FARR
TM
14 1/2" Closed Mouth Trailer-Mounted Bucking Unit
Technical Manual
Hydraulic Motor Service Information
F. SETTING THE DIRECTION OF MOTOR SHAFT ROTATION
For the motor shaft to rotate as described in the section "Direction of Shaft Rotation" on page 4, the
motor has to be put "in phase" before the distributor is assembled.
To set the motor "in phase": Choose any one of the cylinders of the motor (termed the "reference cyl-
inder"). Rotate the motor so that in relation to the center of the motor and the viewpoint of the opera-
tor, the reference cylinder is on the opposite side of the motor and in line with the operator. With an
appropriate lever inserted in the distributor drive pin slot in the end of the shaft, rotate the shaft until
the reference mark to one side of the slot is positioned on the same side as the reference cylinder.
Keeping note of the reference cylinder proceed with the assembly of the distributor. To set the motor
"out of phase": Position the reference cylinder as described above. Rotating the shaft so that the refer-
ence mark is on the opposite side and in line with the reference cylinder (rotated 180° from the in
phase position) the motor will be out of phase and the shaft will rotate in the opposite direction from
that indicated above.
If there are no reference marks on the shaft: Position the reference cylinder as described before.
Rotate the shaft so that the distributor drive pin slot is perpendicular to the line between the center of
the motor and the reference cylinder. Closing one of the cylinder feed channels to the left of the refer-
ence cylinder, rotate the shaft a quarter turn anti-clockwise. The motor is in phase if suction of the cyl-
inder is felt with a finger. The motor is out of phase if the cylinder compression is felt with a finger.
Return the lever to the starting position. If the motor was out of phase, rotate the shaft 180° to put it in
phase, or vice-versa.
H. DISTRIBUTOR ASSEMBLY
IMPORTANT: TO AVOID SERIOUSLY DAMAGING THE MOTOR, DO NOT
ATTEMPT TO PLACE A DISTRIBUTOR COVER PRE-ASSEMBLED WITH ROTARY
VALVE AND DISC DIRECTLY ONTO THE MOTOR COVER. THE INTERNAL COM-
PONENTS OF THE DISTRIBUTOR MUST BE ASSEMBLED SEPARATELY FROM
THE DISTRIBUTOR COVER.
IMPORTANT: ENSURE THAT NO OBJECTS (E.G., LOCATING PINS) FALL INTO
CYLINDER FEED HOLES IN THE MOTOR COVER. IF THIS HAPPENS IT WILL BE
NECESSARY TO DISMANTLE THE MOTOR TO REMOVE THE OBJECT.
See Tool #3.
ROTARY VALVE SUB-ASSEMBLY: Insert the O-ring and plastic slipper with the concave side on the
O-ring side in the seat in the top side of the distributor rotary. The plastic seal should be assembled by first
placing the positioning lug in its seat. For versions with the steel ring; first place the O-ring, then the plastic
seal (without lug) and then the steel ring.
(45 paginas)
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