North American Clutch & Driveline
Rockford, Illinois
Phone: (800) 383-9204
(815) 282-7960
Fax (815) 282-9160
www.naclutch.com
4.8.7 Read the dial indicator. Add shims until the indicator reads 0+0.001 inches
(0.0254 mm.) after installing and properly torquing the mounting bolts.
4.8.8 Tighten the belts using accurate tensioning methods and an accurate belt
tensioning gage. The belts should not be tightened until all the mounting bolts have
been tightened. Make sure that the side loads are lower than those listed in the
allowable side load tables in section 2.4.
5.0 OPERATION
5.1 Clutch Engagement Procedure
5.1.1 The PTO clutch should normally be engaged with the engine operating below
1,000 RPM. After the load has been brought up to engine speed, and the clutch is no
longer slipping, the engine speed may be increased to operating speed.
5.1.2 Where high inertia loads must be picked up, engaging the clutch at 1,000 RPM
may result in stalling the engine. Heavy inertia loads may be brought up to speed by a
series of short engagements and disengagements at intervals long enough to prevent
excessive heat build up in the facings. Under extreme circumstances, the engine
may have to be operated at higher speeds while engagement occurs, but UNDER
NO CIRCUM- STANCES should the clutch be slipped for more than a second or two
without either fully engaging the clutch or completely disengaging the clutch to permit
it to cool.
19