Bush Hog CBH80 - Manual (Page 34)

MODEL CBH70 BACKHOE
ATTACHING KIT INSTRUCTIONS
3-POINT HITCH LINKAGE & HYDRAULIC HOOK-UP
TO TRACTOR HYDRAULIC SYSTEMS.
General Description
Mounting and hydraulics kits do not include hoses
which connect the backhoe control valve to the trac-
tor hydraulic system. Additional hydraulic compo-
nents, hoses and/or kits will be required to complete
the hook-up to the tractor hydraulic system. Refer to
the Hydraulic Hook-up section for further information.
Pumps and reservoir kits are available as options.
The backhoe is mounted on the tractor lower link
arms and an adjustable upper link is supplied to
replace the tractor upper link. A set of stabilizer arms
is included. They bolt from the adjustable upper link
to the backhoe mainframe, locking the hoe rigidly in
one position.
IMPORTANT: Tractor lower links must be kept
free of lifting forces at all times after installation
of the attaching kit, by keeping tractor quadrant
lever in the lowered position.
IMPORTANT: If the 3-Point Kit is to be used with
a PTO & Reservoir Kit, the Reservoir Tank and
it’s fittings should be installed before proceeding
with the 3-Point installation.
ASSEMBLY
IMPORTANT: Tighten all hardware to the require-
ments specified in the torque chart.
! !
WARNING
To prevent bodily injury, do not operate backhoe
unless Lower Link Weldments (17, 18) are prop-
erly installed and adjusted. Failure to do so may
result in backhoe being thrust upward, crushing
operator against cab or ROPS.
1. Use hoist to raise the backhoe mainframe so that
the boom pivot pin is approximately 14” off the
ground.
2. Back tractor close to the backhoe. Connect
tractor lower link arms to lower link mounts using
two L-pins (14), two Cotter Pins (11), and two
Wire Form Cotter Pins (12).
NOTE: If tractor has a Category II hitch, install two
Bushings (15) in lower link arms.
3. Attach Upper Braces (21), to backhoe with 3/4 x
7-1/2” Bolt (50, Lockwasher (9), Flat Washers
(10) and Nut (7). Do not tighten hardware at this
time.
4. Install Bushing (13) or Bushing (16) in the Upper
Bar (20) that most closely matches the diameter of
the tractor upper link pin. No bushing is necessary
for Category II tractors.
5. Secure Upper Bar (20) between Upper Braces (21)
using 3/4 x 4-1/2” Bolt (3), Flat Washers (10),
Lockwasher (9) and Nut (7). Use hoist to raise or
lower backhoe slightly until a hole in the upper bar
aligns with a hole in the upper braces.
6. Attach RH Lower Link Weldment (17) and LH
Lower Link Weldment (18) to backhoe mainframe
using 3/4 x 2-1/4” Bolt (2), Flat Washer (10),
Lockwasher (9), and Nut (7).
7. Align RH and LH Link Weldment (17, 18) with the
upper bar/brace assembly, as close to the tractor
as possible. Use 3/4 x 6” Bolt (4), Flat Washer (10),
Lockwasher (9), and Nut (7). You may need to
return to Step 6 and readjust upward or downward
the bolt connection.
8. Remove backhoe from the tractor.
9. Install connector plate (19) to RH and LH Lower
Link Weldments (17, 18) using 1/2 x 1-3/4” Bolt (1),
Lockwasher (8) and Nut (6).
10. Tighten all hardware at this time. Check your instal-
lation very carefully to be sure all members are cor-
rectly installed and securely fastened.
11. If using optional PTO Pump and Reservoir Kit pro-
ceed to that section prior to remounting the back-
hoe onto the tractor.
12. Connect hoses from the backhoe control valve to
the tractor hydraulic system as described in
“Hydraulic Hook-Up” section, prior to remounting
the backhoe onto the tractor.
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