(
MAINTENANCE/SERVICE
Header Drive
HEADER
DRIVE
BaT
;
pvl I
EX
FORE-AFT
AUGNMENT
Fore-aft mlsalignment of pulleys can cause a
beJl
failure where the backing band splits between V-
belt
sections,
as
shown
at
(A)
.
Check and correct the pulley fore-aft alignment
in
the following order.
1.
Rear
pulley must
be
square
to
frame
as
shown.
To
check,
place
a
straight
edge
along
side
of
rear
pulley
and
check that clearance to frame
at
(L)
and
(M)
is
equal.
To
adjust. loosen nut
(N)
and
move
R/ H gearbox mount forward or
back
to
square rear pulley. Tighten nut (N)
to
secure
the
position
.
NOTE;
Dimension at
(L)
and
(M)
should be
approximately
t7
mm
(0
.67").
but
never less
than 13
mrn
(0
.
51;
to allow for removal and
Installation
of
drive bell.
BELT
FAILURE
DUE
TO
FORE-AFT
MISAlUGNMENT
REAR
PULLEY
SQUARE
TO
FRAME
2.
Rear
OOley
must
align
with
front
pulley
as
shown
below.
To
check,
place
a straight edge
along
skie
of
rear pulley
and
check that dimension (e) at front pulley ls 6 mm (0.241. To adjust, loosen taper lock
bushing
(T)
at
rear pulley
and
move
pulley on gearbox
shaft.
Ensure
that pulley hub
or
bushing does not
contact gearbox seal. Tighten bushing
en
to
secure the position.
NOTES; • If
(C)
Is
differenllhan
(D). see step 4 .
• If 6
mm
dimension can not be achieved
by
moving bushing
(T)
.
go
back
to
step
1
and
purposeJy
misalign rear pulley with frame
to
obtain 6
mm
dimension
at
(C)
. Then proceed with steps 3 and 4.
3. Flat idlers must
align wjth each other as shown. Dimension
(F)
must
equal
dimension (G)
with
in 2
mm
(0.08").
To
adjust Idlers, bend mounting arms
to
suit.
(it
may
be
necessary
to
heat
Idler
arms
to
permit
adequate bending.)
Ll
c
T
o
REAR
PULLEY
AUGNED
WITH
FRONT
PULLEY
AND
IDLERS
AUGNED
4. Front pylley must be square to rear PUlley as shown.
To
check. place a straight
edge
along side
of
front
pulley and check that dimension
(E)
Is
6
mm
(0.24j. To adjust. shim front pulley mounting plate
at
both
front bolls.
or
both
rear bolls
so
that dimensions
(C).
(D)
and
(E)
are all 6
mm
(0.24·) .
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FRONT
PULLEY
SQUARE
TO
REAR
PULLEY
91
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