North American Clutch & Driveline
Rockford, Illinois
Phone: (800) 383-9204
(815) 282-7960
Fax (815) 282-9160
www.naclutch.com
27
NOTE: Forks (1) and (2) must lie in same plane. Figure 13
The centerlines of the power take off shaft and input shaft of the gear head must be parallel.
One method of accomplishing this is shown in Figure 13. To align engine and gear head by this
method, two accurate straight edges of at least 36 inches and a tape measure are required.
Place the straight edges horizontally along the face of the PTO and gear head hubs. Measure
distances A and B. A and B should be equal within 1/8 inch measured 18 inches out from the
centerlines of the shaft. If a difference in A and B of more than 1/8 inch is found the engine
should be moved to bring these distances within 1/8 inch. After A and B have been set the
straight edges should be rotated to the vertical position as shown by the dotted lines in the
sketch. Distance C should be equal to distance D within 1/8 inch measured 18 inches out from
the center of the shaft. If C and D vary more than 1/8 inch measured 18 inches from the shaft
center the engine should be moved until the difference is brought within 1/8 inch. After setting
C and D, A and B should be rechecked and reset if required. Repeat this procedure until
distances A and B and C and D are equal to each other within 1/8 inch measured 18 inches
from shaft centers.
After setting as described above, the engine should be securely anchored. The PTO shaft
centerline and gear head input shaft centerline will now be within 1degree of parallel.
Figure 13: Aligning Engine and Gear Head.
ASSEMBLY INSTRUCTIONS FOR PILOT ROLLER BEARINGS
NACD has available roller type pilot bearings in several sizes for use with PTO’s. Many
specifications have been written to include this type bearing. All of the roller pilot bearings
available are the separate race type i.e. the inner race is removable from the outer race roller
and seal assembly. Due to this construction axial alignment of the inner and outer races is most
important. Data is given here in general terms which will assure proper bearing mounting for
any unit using this type pilot bearing. In most cases installation drawings are also available for
specific units using this bearing.
