Service Manual
NOTE: These materials are for use by trained technicians who are experienced in the service and repair of outdoor power
equipment of the kind described in this publication, and are not intended for use by untrained or inexperienced individuals.
These materials are intended to provide supplemental information to assist the trained technician. Untrained or inexperienced
individuals should seek the assistance of an experienced and trained professional. Read, understand, and follow all instructions
and common sense when working on power equipment. This includes the contents of the product’s Operators Manual, supplied
with the equipment. No liability can be accepted for any inaccuracies or omission in this publication, although care has been
taken to make it as complete and accurate as possible at the time of publication. However, due to the variety of outdoor power
equipment and continuing product changes that occur over time, updates will be made to these instructions from time to time.
Therefore, it may be necessary to obtain the latest materials before servicing or repairing a product. The company reserves the
right to make changes at any time to this publication without prior notice and without incurring an obligation to make such
changes to previously published versions. Instructions, photographs and illustrations used in this publication are for reference
use only and may not depict actual model and component parts. © Copyright 2005 MTD Products Inc. All Rights Reserved
MTD Products LLC - Product Training and Education Department
Cub Cadet 8000 Compact Tractor Attachments
Back Hoe Installation
IMPORTANT: READ SAFETY RULES AND INSTRUCTIONS CAREFULLY
This Service Manual is not a substitute for the Operator’s Manual. You must read, understand
and follow all of the directions in this manual as well as the Operator’s Manual before working
on this power equipment.
PRINTED IN USA
CUB CADET LLC, P.O. BOX 361131, CLEVELAND, OH 44136-0019
FORM NO.769-00970
(11/2003)
TABLE OF CONTENTS
Backhoe Installation..........................................................................................1
8000 Series and Attachments
1. BACKHOE INSTALLATION
NOTE: These instructions are intended as a
supplement to the “Operator’s Manual”, Form #
769-00735, and are to be used in conjunction
with the “Operator’s Manual”, as well as the
installation instructions for the backhoe mounting frame. Read and understand all of the safety
instructions in the backhoe “Operator’s Manual”.
NOTE: There are particular dangers to be aware
of when working with large equipment. For
instance, danger of crushing injury exists from
the weight of the equipment as well as from the
unintended actuation of the equipment. Do not
attempt to install this backhoe unless proper
material handling equipment is available.
NOTE: It is necessary to start the tractor and
operate the backhoe from outside of the operators seat while performing this installation. This
is the only time the backhoe should be operated
from someplace other than the seat.
NOTE: When it is not immediately necessary to
have the engine running for the purpose of
installation, turn the engine off and remove the
key from the key switch.
previously installed, with the backhoe added
afterward.
1.3. Check the contents of the backhoe kit. A listing
of the contents will accompany the kit.
1.4. Position the mounting frame so that the angled
guide tabs on the front cross member are on top.
1.5. Test fit the latching bracket to the mounting
frame, and secure it with the T Handle clevis
pins to ensure that it is seated fully. See Figure
1.5.
Receiver
T Handle
clevis pins
Frame
NOTE: Do not attempt to repair or uncouple any
hydraulic connections unless all attachments are
resting on the ground, and pressure has been
relieved format system.
NOTE: The complete backhoe is contained in at
least three parts: the backhoe itself (590-644-
100) and the subframe that is necessary to
mount it (590-646-100), and the bucket or buckets to be used on the backhoe. They include:
9” bucket................................590-648-100
12” bucket................................590-649-100
16” bucket................................590-650-100
18” bucket................................590-651-100
24” bucket................................590-652-100
36” bucket................................590-653-100
1.1. In addition, the backhoe attachment must be
used in conjunction with the font end loader
attachment: 590-641-100.
1.2. The front end loader may be installed at the
same time as the backhoe, or it may have been
Figure 1.5
1.6. Test fit the receiver to the mounting frame.
See Figure 1.6.
Mounting
Frame
Receiver
Figure 1.6
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1.7. If necessary, minor adjustments can be made to
insure ease of installation: e.g., if a weld-bead
interferes with the fit, the corner may be radiused for clearance.
1.8. Once fit is confirmed, install the receiver and
latching bracket on the tractor frame.
NOTE: If a front end loader has been previously
installed, the cross member that ties the two
loader rear mounts to the transmission housing
must be removed. The latching bracket bolts on
in place of the cross member.
1.9. Remove the four bolts that hold the cross member to the bottom of the transmission housing
using a 19 mm wrench. See Figure 1.9.
1.11. Lift the receiver into position in place of the cross
member. See Figure 1.11.
Receiver in position
Loader
rear mounts
Cross member
Figure 1.9
1.10. Remove the four nuts, bolts and lock washers
that hold the cross member to the rear loader
mounts using a pair of 3/4” wrenches, and
remove the cross member.
WARNING: cross member is heavy.
Figure 1.11
NOTE: A small jack stand will fit in the crotch of
the receiver, supporting it securely until the bolts
are installed.
1.12. Attach the receiver to the loader rear mounts
and transmission housing using the hardware
previously removed. Do not tighten any receiver
mounting bolts until all of them are in place.
1.13. Remove the two nuts and two bolts that secure
the P.T.O. shield to the back of the transmission
using an 18 mm wrench. See Figure 1.13.
P.T.O. shield
P.T.O. shield bolts
P.T.O. shield nuts
2
Figure 1.13
1.14. Disconnect the lower link limiter from the
R.O.P.S. bracket on the axle by removing the
hairpin clip and clevis pin. See Figure 1.14.
1.18. Remove the hairpin clip and clevis pin that
secure the top link to the draft control input
bracket. See Figure 1.18.
Bracket
Lower link limiter
Lower link
lift rod
Lower Link
Figure 1.14
1.15. Disconnect the lower link lift rod from the lift arm
by removing the click pin and clevis pin. Allow
the lower link to rest on the ground.
1.16. Remove the bolt that secures each lower link
pivot pin using a 14 mm wrench.
See Figure 1.16.
Draft control
input bracket
1.19. Remove the top link.
1.20. Install the two nuts that held the P.T.O. shield
and draw bar bracket to the back of the transmission housing. Put them on finger-tight only.
1.21. Remove the four bolts that hold the draw bar
bracket to the bottom of the transmission housing using a 19mm wrench. See Figure 1.21.
Top link
Figure 1.18
Pivot pin
Lower link
Figure 1.16
1.17. Withdraw each pivot pin and remove each lower
link.
Draw bar bracket
Figure 1.21
1.22. Leave the draw bar bracket in position. It will
hang securely on the two studs on the back of
the transmission housing.
1.23. Position the backhoe latching bracket beneath
the draw bar bracket, using a hydraulic jack.
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1.24. Fasten the latching bracket and draw bar
bracket to the bottom of the transmission housing using the six 14 mm by 40 mm bolts and
lock washers provided with the backhoe. See Figure 1.24.
Mounted
latching bracket
1.26. Confirm that the mounting frame seats properly
in the receiver. See Figure 1.26.
Figure 1.24
NOTE: Use a 22mm wrench to tighten the bolts.
1.25. Test fit the mounting frame. Lift it into position
using a hydraulic jack, and confirm the correct fit
of the frame in the receiver and latching bracket
when they are mounted on the tractor.
See Figure 1.25.
Mounted
Receiver
1.27. Confirm that the mounting frame seats fully into
the latching bracket, allowing the T-handle clevis
pins to drop completely to their stop shoulders.
See Figure 1.27.
Guide tab at front
of mounting frame
Test fit mounting frame
Figure 1.26
Witness mark from
weld interference
Figure 1.25
NOTE: The draw bar may be left in or removed,
at the operator’s or installers discretion. The
draw bar can be installed or removed once the
backhoe is mounted, but it is difficult to reach the
hairpin clips that secure the clevis pins.
Figure 1.27
NOTE: If there is a fit problem, the test fit will
help identify the source of the issue.
NOTE: If the mounting frame does not fit properly, it may be necessary to radius some welds,
or adjust the mounting positions of the receiver
and latching bracket. If these minor adjustments
do not solve the problem, call Cub Cadet Technical support.
4
1.28. If necessary, the numbers may be ground off of
the T handle clevis pins to ease installation.
See Figure 1.28.
T handle clevis pin
with embossed numbers
May need to remove numbers
Figure 1.28
1.29. After correct fit is confirmed bet ween the mounting frame, receiver, and latching bracket, attach
the mounting frame to the backhoe.
See Figure 1.29.
1.31. Install the braces diagonally between the mounting frame and the backhoe, using four 3/4” X 2 1/
2” bolts, nuts, and lock washers.
See Figure 1.31.
Braces
Figure 1.31
NOTE: There is a slight off-set to the braces,
allowing them to fit flush against the backhoe
and mounting frame.
3/4” bolt
Mounting frame
NOTE: The guide tabs at the front of the mounting frame face up.
1.30. Secure the mounting frame to the backhoe using
the two 7/8” X 3 1/2” bolts, nuts, and lock washers in the rear holes, and the 3/4” X 3 1/2” bolts,
nuts and lock washers in the front holes.
7/8” bolt
Figure 1.29
1.32. Verify that the mounting frame and backhoe are
at a 90 degree angle to one another, then tighten
the 7/8” bolts using a pair of 1 5/16” wrenches.
Tighten the 3/4” bolts using pair of 1 1/8”
wrenches.
1.33. Mount the seat pedestal to the backhoe. Tighten
the bolts using a pair of 17mm wrenches.
See Figure 1.33.
Seat brackets
Seat pedestal
Figure 1.33
1.34. Position the backhoe behind the tractor, oriented
as it is to be installed.
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1.35. Remove the two seat brackets from the seat
pedestal using a pair of 13mm wrenches.
1.36. Place the backhoe seat atop the pedestal, and
secure it by running 5/16” bolts with lock washers through the holes previously occupied by the
seat bracket bolts, and into the threaded holes in
the bottom of the seat. See Figure 1.36.
Figure 1.36
1.39. Identify the feed and return lines where they
enter the hydraulic valve package. As see from
behind the backhoe, looking toward the front of
the tractor, the feed line is on the right side,
entering the middle port of the valve. The return
line is on the left, entering the lowest port on the
valve.
1.40. Connect the hoses on the backhoe to the two
separate lengths of hose that came with it, keeping track of which hose is which. Connect the
hoses using two 3/8” JIC unions.
See Figure 1.40.
Hoses from backhoe
3/8” JIC Unions
Additional
lengths of hose
1.37. Tighten the bolts using a 1/2” wrench. They are
easily reached once the threads are started by
tilting the seat forward.
1.38. Remove the cover from the backhoe control console using a pair of 13mm wrenches.
See Figure 1.38.
Return
line
Figure 1.38
Feed
line
Figure 1.40
1.41. Tighten the fittings using a 7/8” wrench and a 13/
16” wrench.
1.42. If the loader had been previously installed, perform the following steps:
1.43. Disconnect the loader return hose and the 90
degree fitting from the adaptor on the front surface of the modulating valve.
6
1.44. Disconnect the loader power beyond hose from
the rear-most 90 degree fitting on the modulating valve. See Figure 1.44.
1.55. Couple the pressure hose leading to the backhoe to the power beyond hose from the loader.
See Figure 1.55.
Modulating valve assembly
Front
Rear
Insert T
here
Loader power
beyond hose
Loader return hose
Figure 1.44
1.45. Install the T fitting in place of the 90 degree fitting on the front of the block. The center leg of
the T should face down.
1.46. Install the 90 degree fitting and loader return
hose onto the forward-facing leg of the T.
1.47. Assemble a 3/8” male coupler to a second 90
degree fitting and install that to the center (bottom) leg of the T fitting so that the coupler faces
forward.
Return from loader
Pressure to loader
Return from backhoe
Pressure to backhoe
Figure 1.55
1.56. When the hydraulics are connected as illustrated, both the front end loader and the backhoe should be functional.
1.57. Install the cover and hand bar on the backhoe
control console. Tighten the nuts and bolts
using a pair of 13mm wrenches.
See Figure 1.57.
Power beyond
from loader
1.48. Adapt a 3/8” female coupler to the loader power
beyond hose using a double male fitting.
1.49. Adapt a 3/8” male coupler to the 90 degree fitting
on the modulator valve that the loader power
beyond hose had been connected to.
1.50. Adapt a 3/8” male coupler to the pressure hose
that feeds hydraulic fluid to the backhoe, using a
double male fitting.
1.51. Adapt a 3/8” female coupler to the return hose
from the backhoe, using a double male fitting.
1.52. Install coupler covers on all couplers.
1.53. Couple the backhoe pressure hose to the loader
power beyond hose.
1.54. Couple the return hose from the loader to the
forward-facing coupler attached to the T fitting
on the front surface of the modulator valve.
Figure 1.57
7
1.58. Thread the stabilizer control levers into the linkages inside the two close-set holes in the top of
the console. See Figure 1.58.
1.63. Tighten the jam nuts using a 14mm wrench to
secure them in this position.
1.64. Tuck the bottom of each rubber boot into the
hole surrounding each control lever, to help keep
out water and dirt. See Figure 1.64.
Figure 1.58
1.59. Once installed, tighten the jam nuts using a
14mm wrench.
1.60. Start the two levers that control the boom, swing,
dipperstick and shovel control levers through
their rubber boots and bushings.
1.61. thread the two levers into the linkages visible
within the two larger holes in the console cover.
See Figure 1.61.
Figure 1.64
1.65. Ensure that no unsafe conditions will arise from
starting the engine or operating the backhoe.
1.66. Start the engine briefly, and check for any
hydraulic leaks. Turn off the engine, relieve
pressure, check for and repair any leaks before
continuing.
NOTE: Mounting the backhoe to the tractor is
the only time that it is recommended to operate
the backhoe while not occupying the operator’s
seat.
Figure 1.61
1.62. Each of the two levers has a slight bend in it.
Position the two levers so that they are angled
away from one another.
8
1.67. If no leaks exist, re-start the engine, lower the
stabilizers and manipulate the boom and dipperstick to allow the installation of the bucket.
See Figure 1.67.
mounting frame up to just beneath the level of
the latching bracket and receiver.
1.70. Ensure that the hydraulic hoses are clear of the
wheel paths, and back-up the tractor until the
center cross member of the mounting frame is
just behind the latching bracket.
1.71. Check the final alignment of the front cross
member with the receiver. It should be roughly
centered.
Pin
Anti-seize
Bucket
Figure 1.67
NOTE: It is generally easier to connect the
bucket to the fixed portion of the dipperstick first.
1.68. Secure the bucket to the dipperstick using the
large pins. Lock the pins in place using the nuts
and bolts provided in the kit. See Figure 1.68.
compound
NOTE: small lateral adjustments can be made
using the swing of the boom. Larger adjustments will require realignment of the tractor.
1.72. Using the stabilizers and bucket, raise the
mounting frame to make the final height adjustment. The front cross-member of the mounting
frame should be level with the receiver. The
center cross-member should be level with the
latching bracket.
2
1
Receiver
Front Cross member
Figure 1.68
NOTE: There may be some interference
between the hardware and the weld beads on
the collars that the bolts pass through. This is
acceptable, and creates and additional locking
effect.
1.69. Once the bucket is installed, it may be used in
conjunction with the stabilizers to raise the
Figure 1.72
1.73. Once correct alignment is achieved, back the
tractor into the mounting frame, seating the center cross member into the latching bracket.
9
1.74. Backing-up further will seat the front cross member into the receiver. See Figure 1.74.
Figure 1.74
1.75. Once both cross members are fully seated,
insert the T handle Clevis pins through the latching bracket, securing the mounting frame to the
tractor.
1.79. Make a final check for leaks. If non exist, and
the backhoe operates properly, it may be put into
service.
1.76. Lock the T handle clevis pins in place using the
large hairpin clips supplied.
1.77. After the backhoe and mounting frame are safely
mounted on the tractor, lubricate all of the
grease zirchs on the backhoe attachment. See
Figure 1.77.
Figure 1.77
1.78. Start the engine, and run the backhoe through its
full range of motion to purge any air from the
hydraulic system.
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