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4-6 BLADE SPINDLE SERVICE (Figure 4-5)
If shaft bearings or other parts require replacement,
proceed as follows:
NOTE
It is recommended that a Bush Hog dealer or other
qualified person service the blade spindle. If blade
spindles must be disassembled, special Bush Hog
spanner wrenches are supplied for this operation. The
Sheave Wrench is used on the outer shaft drive
sheave. The Shaft Wrench is used in the notches on
either end of the outer shaft. These wrenches are
stored in the tool box on the frame.
A. Wearing heavy gloves to protect hands,
remove blades from spindle, belts from sheaves and
remove complete spindle assembly from deck.
B. Remove lock nut above sheave on end of of inner
shaft.
C. Remove drive sheave from inner shaft. (A gear
puller may be required for this operation.) Remove the
woodruff key from the inner shaft.
D. Support the assembly on the blade carrier and
press the inner shaft and lower inner bearing out.
E. To remove the bearing from the shaft, support the
inner bearing race and press shaft out.
F. Press upper inner bearing out of the assembly.
G. Unstake sheave from upper end of outer shaft
and unstake blade carrier from lower end of outer shaft
using a blunt punch or chisel. (Use care so as not to
damage threads.) Clamp the blade carrier into a vise and
remove the drive sheave using the sheave wrench
(95778).
These threads are left handed - to loosen,
turn clockwise!
NOTE: If your vise is not large enough to clamp the
blade carrier, reinstall the blade onto the carrier. Tighten
the bolts only “finger tight”. The blade may then be
clamped in the vise. Also notice that it makes no differ-
ence if the blade carrier loosens first. If the blade carrier
comes off first, remove it from the vise and clamp the
sheave wrench into the vise with “pins” pointing upward.
Turn assembly upside down and place sheave onto
“pins”. The shaft wrench may then be used on the oppo-
site end of the shaft to unscrew it from the sheave.
These threads are left handed - to loosen, turn clock-
wise.
H. Support the housing and press the outer shaft and
lower bearing out.
I. Press the upper bearing out of the housing.
J. Support the lower bearing and press the outer
shaft out.
BLADE SPINDLE REASSEMBLY
A. Install the inner shaft into the outer shaft by press-
ing upper and lower inner bearings into place. Press on
the inner and outer race of the bearings
simultaneously
until the bearings bottom out on the shoulder of the inner
shaft.
B. Install the outer shaft sub-assembly into the hous-
ing by pressing the upper and lower outer bearings into
place. Press on the inner and outer race of the bearings
simultaneously
until the bearings bottom out on the
shoulder of the outer shaft.
Figure 4-5 Blade And Spindle Assembly
Drive Sheave for Inner Shaft
Drive Sheave for Outer Shaft
Upper Bearing for Inner Shaft
Woodruff Key
Inner Shaf
t
Shaft Wrench
Upper Bearing for Outer Shaft
Sheave Wrench
Outer Shaft
Hub
Lower Bearing for Outer Shaft
Lower Bearing for Inner Shaft
Blade Carrier
Belleville Washer &
Bolt
Shaft Washer
Lower Blade
Blade Bushing
Blade Nut
Belleville Washe
r &
Bolt
Nut for Inner Shaft
Flat Washer
15
Upper Blade Disc
Upper Blade
Blade Nut
Bolt
Flatwasher
C. Thread the outer shaft sheave and blade car-
rier onto the assembly.
These threads are left
handed - to tighten, turn counter-clockwise.
Clamp the blade carrier in a vise and insert the
sheave wrench pins into the outer drive sheave.
Using a torque wrench in conjunction with the
sheave wrench, tighten the assembly to 200 ft./lbs.
Refer to Fig. 4-6 on following page for the required
torque for your specific torque wrench.
D. Restake the blade carrier and drive sheave
into the notches of the outer shaft.
E. Install the woodruff key, sheave, flat washer
and nut onto the inner shaft and torque the nut to 76
ft./lbs.
F. Place the blade bushing onto the inner shaft
with the ring side toward the bearing (Fig. 4-5)
Install the upper blade disc with bolts and belleville
washers onto the blade carrier.Torque to 31 ft./lbs.
G. Install the shaft washer, lower blade belleville
washer and blade bolt onto the inner shaft and
torque the blade bolt to 76 ft./lbs.