13
S/N 27958 ON
TO S/N 27958
1. For tightening motor V-belt on rigid base plate, remove
appropriate quantity of shims (Part No. 324A) under
the motor until the desired total ex of the V-belt is
approximately ½”.
1. For tightening motor V-belt on oating adjustable motor
mounting plates (Part No. 16015-10 or 16015-11), loosen
the upper wing nuts (Part No. 16015-3). Then loosen the
bottom wing nuts (Part No. 16015-3) which are located
under the mounting plate. This enables the motor
mounting plate to drop to the desired belt tension.
Re-tighten the upper wing nuts evenly so that the motor
stays horizontal. Do not tighten belt to extremes. This will
cause undue pressure on and premature failure of the
motor bearings.
ADJUSTMENTS
C. MOTOR ADJUSTMENT:
Starting with Serial Number 27958 three (3) phase Model 3334’s will no longer be equipped with an
adjustable motor base plate, Part No. 16015-10 and 16015-11. The motor will be bolted to the bottom of the
base structure and V-belt tension adjusted utilizing shims.
This change has evolved as a result of the market demand for higher blade speeds. The revised mounting
procedure will insure a more rigid motor installation creating positive belt alignment and minimizing machine
vibration.
The base bottom has been redesigned to accept the frame sizes of the current 3 phase motors. Units prior to
Serial Number 27958 can be retrotted by ordering Part No. 16015-12 motor base plate and template (at),
and 36 pieces Part No. 324A motor shims.
C. SAW GUIDE BAR AND SAW GUARD:
The factory recommends that when service is performed on any BIRO SAW the servicing agency be sure
that the BIRO SAW is equipped with the most current safety features available.
In September 1969 the Model 3334 began production. The Model 3334 was rst equipped with a 19” saw
guide bar until March 1973 when the length was extended to 23”. In June 1977, the bar was shortened to 22”
and is used in current production.
The same saw guard (Part No. 255) on saw guide bar used on the Models 33 and 34 was carried over to the
Model 3334 and used in production until June 1975.
Part No. 663 Saw Guard on saw guide bar replaced Part No. 255 in June 1976 starting with Serial No.
12242. At the same time, the Part No. 661 Guard on head Door introduced in 1974 was replaced by Part No.
661-1 Guard on Head Door. Both Part No. 663 and 661-1-DECA are current production today.
The factory recommends that all Model 3334’s prior to Serial No. 12242 be updated by installing the
current SAW GUIDE BAR ASSEMBLY (Part No. A116-22) and SAW GUARD ON HEAD DOOR
(Part No. 661-1-DECA).
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