allen 070080, Safety & Operation Manual

Page: 49 / 62

Flexible Coupling for Engine/Transmission
A flexible coupling is mounted between the engine and transmission. The half with the 1” bore mounts to the engine,
the half with the ¾” bore mounts to the transmission. A flexible coupling element is between the two coupling halves.
1. Check the parallel alignment of the coupling in at least 4 places (every 90 degrees), top and bottom and left and
right sides. The sides of each coupling half must be within 0.015” in all axes. If adjustment is required use the
following procedure to align.
A. To begin this adjustment loosen engine and transmission mounting bolts but do not remove.
B. First make the vertical adjustment to the coupling assembly by moving the transmission up or down on the
transmission mount plate. Tighten transmission mounting bolts.
C. Using a straight edge make the horizontal adjustment to the coupling assembly by moving the engine left or right
on the engine mounting plate. Tighten engine bolts.
D. When alignment is correct and the engine and transmission mount bolts are secured, recheck alignment with
a straight edge.
E. When alignment is correct, both coupling halves and the flexible coupling element should be centered between
the engine and transmission shafts. The coupling assembly should be pressed together as tightly as possible
and the set screws tightened to the torque specified. Use thread locking sealant. See notes below.
MAXIMUM PARALLEL
MISALIGNMENT: .015”
STRAIGHT EDGE
ADJUST ENGINE HORIZONTALLY
FOUR(4) ENGINE
MOUNTING BOLTS
TORQUE SET SCREWS
EVENLY TO 120 IN. LBS.
THREAD LOCKING
SEALANT
ADJUST HYDROSTATIC TRANSMISSION
VERTICALLY/UP-DOWN
FOUR(4) TRANSMISSION
MOUNTING BOLTS
Flex Coupler Adjustments
SECTION 3
SERVICE
069583 Page 49