North American Clutch & Driveline
Rockford, Illinois
Phone: (800) 383-9204
(815) 282-7960
Fax (815) 282-9160
www.naclutch.com
4.4.4 Install the PTO with the cross shaft in a horizontal position. Install two (2) 5” long
guide bolts into the flywheel housing bolt holes, located approximately at the 3 o’ clock
and 9 o’ clock positions. Position the PTO on the guide bolts to help align the unit and
support the weight while the mounting bolts are installed.
Start the PTO shaft in the pilot bearing. Carefully align the clutch facing teeth with the
teeth in the drive ring. Temporarily install longer bolts in 4 bolt holes 90° apart, and
tighten the bolts alternately and evenly to draw the PTO housing toward the flywheel
housing. Replace the longer bolts with the shorter ones as necessary, and tighten
to draw the PTO into place. Then remove the temporary bolts and guide bolts, and
replace them with proper mounting bolts. Install bolts and lockwashers. Use U.S.A.
SAE Grade 5 bolts (or equivalent) with lockwashers. Torque bolts according to the
following chart.
Note: Many engines use metric threads, so the following chart would not be applicable.
Do not use bolts made with U.S. threads in holes with metric threads. The threads will
be damaged, rendering them unusable.
Use the engine manufacturer’s torque specifications if different from the above torque
recommendation.
4.4.5 Rap the output end of the shaft with a soft mallet to relieve any pre-load on the engine
crankshaft that may have built up as a result of the pilot bearing’s fit on the shaft pilot
4.5 Correct Handle Installation Position:
Install the clutch handle or release mechanism. Position the handle
so that it is pointing either straight up or straight down when the
clutch is in the engaged position. Positioning the lever vertically
minimizes loading on the release bearing.
If an altered or special clutch engagement mechanism is used
(remote linkage mechanism is not recommended), be sure there
is no pre-load on the release bearing either sideways or toward
the engaged or release position. There should be no pre-load on
the cross shaft in any direction, forward, rearward or sideways. A
torsional and forward or rearward load (only) will be applied (only)
during the engagement or disengagement cycle.
15
SAE #1 Hsg.
(7/16-14 bolts)
42-50 ft. lbs. (57-68 Nm.)