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INSTRUCTIONS FOR INSTALLING
CRUMBER AND RESTRAINT BAR KITS
ON 660, 760, 860, AND 960 TRENCHERS
PARTS LIST - COMMON PARTS FOR CRUMBER
REF. PART NO. DESCRIPTION QTY. REF. PART NO. DESCRIPTION QTY.
1
1. 195-545 WASHER - flat, 3/4 ........................... 6
2. H673072 LINK - short ...................................... 2
3. H672721 LINK - long ....................................... 2
4. H673071 ARM - blade ..................................... 1
5. 132-312 PIN - cotter, 3/16 .............................. 4
PARTS LIST - KIT H939129, 1.2 m (4 Foot) Boom
REF. PART NO. DESCRIPTION QTY. REF. PART NO. DESCRIPTION QTY.
11. H672169 BOOM - crumber .............................. 1 12. H438909 DECAL .............................................2
PARTS LIST - KIT H939130, 1.5 m (5 Foot) Boom
REF. PART NO. DESCRIPTION QTY. REF. PART NO. DESCRIPTION QTY.
13. H672170 BOOM - crumber .............................. 1 14. H438909 DECAL .............................................2
PARTS LIST - KIT H939131, 1.8 m (6 Foot) Boom
REF. PART NO. DESCRIPTION QTY. REF. PART NO. DESCRIPTION QTY.
15. H672171 BOOM - crumber .............................. 1 16. H438909 DECAL .............................................2
6. 111-538 BOLT - 1/2 NC x 4 ............................ 2
7. H274894 WASHER - flat, 1-5/64 ......................2
8. 131-1153 NUT - lock, 1/2 NC ........................... 2
9. H309450 PLATE ..............................................1
10. H438910 DECAL .............................................1
PARTS LIST - KIT H939132, 2.1 m (7 Foot) Boom
REF. PART NO. DESCRIPTION QTY. REF. PART NO. DESCRIPTION QTY.
17. H672172 BOOM - crumber .............................. 1 18. H438909 DECAL .............................................2
PARTS LIST - KIT 443778A1, 1.2 m (4 Foot) Boom
REF. PART NO. DESCRIPTION QTY. REF. PART NO. DESCRIPTION QTY.
19. H672169 BOOM - crumber .............................. 1 20. 428652A1 DECAL .............................................2
PARTS LIST - KIT 443779A1, 1.5 m (5 Foot) Boom
REF. PART NO. DESCRIPTION QTY. REF. PART NO. DESCRIPTION QTY.
21. H672170 BOOM - crumber .............................. 1 22. 428652A1 DECAL .............................................2
Copyright
© 2002 Case Corporation. All Rights Reserved
Bur 8-75222
Printed in U.S.A.
Issued February, 1988
Reissued April, 2002
Page 2
PARTS LIST - KIT 443780A1, 1.8 m (6 Foot) Boom
REF. PART NO. DESCRIPTION QTY. REF. PART NO. DESCRIPTION QTY.
23. H672171 BOOM - crumber ...............................1 24. 428652A1 DECAL ..............................................2
PARTS LIST - KIT 443781A1, 2.1 m (7 Foot) Boom
REF. PART NO. DESCRIPTION QTY. REF. PART NO. DESCRIPTION QTY.
25. H672172 BOOM - crumber ...............................1 26. H428652A1 DECAL ..............................................2
PARTS LIST - COMMON PARTS FOR RESTRAINT BAR
REF. PART NO. DESCRIPTION QTY. REF. PART NO. DESCRIPTION QTY.
27. 428652A1 DECAL .............................................2 28. H438910 DECAL ..............................................1
PARTS LIST - KIT 443782A1, 1.2 m (4 Foot) Boom
REF. PART NO. DESCRIPTION QTY.
29. H434220 BAR - restraint ..................................1
2
PARTS LIST - KIT 443783A1, 1.5 m (5 Foot) Boom
REF. PART NO. DESCRIPTION QTY.
30. H434221 BAR - restraint ..................................1
PARTS LIST - KIT 443784A1, 1.8 m (6 Foot) Boom
REF. PART NO. DESCRIPTION QTY.
31. H434222 BAR - restraint ..................................1
PARTS LIST - KIT 443785A1, 2.1 m (7 Foot) Boom
REF. PART NO. DESCRIPTION QTY.
32. H434223 BAR - restraint ..................................1
GENERAL INFORMATION
The illustration for this instruction sheet is on the last
page. Separate the pages so that you can see the
illustration as you read the instructions.
The reference numbers and the letters on the
illustration are the same as the reference numbers
and letters in the instructions.
Special torque specifications are included in the
instructions. If torque specifications are not included in
the instructions, use standard torque specifications.
See your Service Manual or Case Dealer if you need
standard torque specifications.
NOTE: Kits H939129, H939130, and H939131 are
for the 660, 760, and 860 Trenchers. Kit H939132
is for the 760 and 860 Trenchers. Kits 443778A1,
443779A1, 443780A1, 443781A1, 443782A1,
443783A1, 443784A1, and 443785A1 are for 960
Trenchers.
Bur 8-75222 Issued 4-02 Printed in U.S.A
Page 3
3
PREPARATION
1. Loosen the nuts (A) and bolts (B) that hold the
existing guard (not shown) in between the
mounting brackets (C).
2. Remove the existing guard (not shown) from the mounting brackets (C).
BOOM/BAR INSTALLATION
1. Install the boom (11, 13, 15, 17, 19, 21, 23, or 25)
or restraint bar (29, 30, 31, or 32) in between the
mounting brackets (C).
2. Tighten the nuts (A) on the bolts (B) that hold the
boom or bar in between the mounting brackets
(C).
CRUMBER INSTALLATION
1. Install a flat washer (1) on the pin of both a short link (2) and a long link (3).
2. Install the pins of the links (2 and 3) through the holes in the blade arm (4).
CRUMBER BLADE INSTALLATION
NOTE: The crumber blade (D) is not included in
these kits.
1. Put the crumber blade (D) and plate (9) in position on the blade arm (4) as shown.
2. Install the bolts (6), flat washers (7), and lock nuts (8) as shown.
DECAL INSTALLATION
1. Clean each side and top of the boom (11, 13, 15,
17, 19, 21, 23, or 25) and restraint bar (29, 30, 31,
or 32) of all dirt, grease, and oil.
2. Install the decal (10) on the top of the boom (11,
13, 15, 17, 19, 21, 23, or 25) and restraint bar (29,
30, 31, or 32) as shown.
3. Cut both decals (12, 14, 16, 18, 20, 22, 24, 26, or
28) in half.
4. Install a complete decal (12, 14, 16, 18, 20, 22,
24, 26, or 28) on each side of the boom (11, 13,
15, 17, 19, 21, 23, or 25).
3. Install a flat washer (1) on the pin of each of the
links (2 and 3) that are installed in the blade arm
(4).
4. Install the pins on the other links (2 and 3) in the
boom (11, 13, 15, 17, 19, 21, 23, or 25) as shown.
5. Install the blade arm (4) and links (2 and 3) on the
boom (11, 13, 15, 17, 19, 21, 23, or 25) and the
links (2 and 3) already installed in the boom.
6. Install the cotter pins (5) in the link pins.
ADJUSTMENT
1. Lower the crumber are into position.
2. Loosen the nuts (A) and bolts (B).
3. Move the boom (11, 13, 15, 17, 19, 21, 23, or 25)
until the crumber blade is 75 to 100 mm (3 to 4
inches) from the teeth on the digging chain.
4. Tighten the nuts (A).
Bur 8-75222 Issued 4-02 Printed in U.S.A
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4
1
1
1
4
8
7
9
1
10
28
D
6
C
8
A
7
1
3
1
B
2
5
5
5
C
5
13
13
15
17
30
1416
19
29
3
12
202224
A. Nut C. Mounting Bracket
B. Bolt D. Crumber Blade (Not Included)
23 21
25
31
32
18
26
Bur 8-75222 Issued 4-02 Printed in U.S.A
2
BS02D004
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