3a 3b – Rivera Primo Brute IV User Manual

Page 3

STEP 4:

Install the Motor Plate (front section PP-303, PP-403, PP-503,
or PP-603), start the four front section bolts, but only hand tight-
en at this time!
Install the 4 center bolts that attach the front section of the
Motor Plate Assembly to the rear section. TIGHTEN THE
MOTOR PLATE BOLTS, THE BEARING SUPPORT BOLTS
AND THE CENTER BOLTS TO 29 FOOT POUNDS OF
TORQUE AT THIS TIME, WHILE ENSURING THAT THE
PLATES ARE PROPERLY SEATED AND ALIGNED. If you
have a PP-400 (show chromed alternator cover) install it now!

STEP 5:

Apply a liberal amount of bearing grease to the transmission main-shaft
splines to act as a corrosion inhibitor. The grease also protects the
splines by absorbing shock-loads & preventing rust.

STEP 6:

Install the starter jack shaft mechanism (extender, spring, pin-
ion gear, thrust washer, lock washer, and bolt). Make sure the
lock washer is correctly oriented. Use 1-2 drops of blue
threadlock & snug the bolt. Bend the locking-tab over to keep
the bolt from vibrating loose.

STEPS 3A & 3B

Primo Belt Drives PP-502 Motor Plate assembly (rear section) for
Dyna Glide is notched for swing-arm pivot-boss clearance (photo 3A).
Approximately .125” of material must be removed from the end of the
nut & swing arm pivot bolt assembly (photo 3B) to allow clearance for
the Brute IV starter ring-gear before installing the clutch basket.
Remove enough material from the end of the nut & bolt to allow the
starter ring gear & clutch basket assembly to be installed & rotated with
approximately .100” clearance between the ring gear & the nut-bolt.

PP-400

See page 7 for starter mechanism diagram!

STEP 7:
Install the rear pulley (clutch basket) and hand tighten the clutch hub nut making sure it is snug. Note that this

nut is left-hand thread. At this time it is important to check the air gap between the back side of the starter ring

gear and the pinion gear. Recommended gap should be .075” to .125”. Use an 1/8” Allen wrench to measure the gap.

Just slip the short end of the wrench between the ring gear & the pinion gear. If it fits, great. If there is too much gap,

the jackshaft assembly should be shimmed to reduce the gap to the spec above (order #1185-0500 shim kit).

Air gap between ring gear

and pinion gear

Measuring the air gap