169874 Revision C Page 1 of 38
Contents
Installation Instructions .............................................................................................................................. 2
Replacing Front Shock Mounts ............................................................................................................. 2
Replacing Side Stabilizing Members .................................................................................................... 8
Replacing Center Stabilizing Member ................................................................................................ 11
Removing Rear Shock Supports ......................................................................................................... 13
Installing Hydraulic Insulators –Multifunction Control Block .......................................................... 25
Installing Hydraulic Insulators – Drive Manifold ............................................................................... 27
Installing Hydraulic Insulators – Return Manifold Assembly ........................................................... 29
Installing Cable Ties ............................................................................................................................. 36
Part List .................................................................................................................................................. 37
Self-Propelled Windrowers
M155 Cab Isolation Kit (MD #166759)
(formerly B5925)
Installation Instructions
M155 Self-Propelled Windrower Cab Isolation Kit MD #166759
INSTALLATION INSTRUCTIONS
169874 Revision C Page 2 of 38
The Cab Isolation kit (MD #166759) can be used to reduce noise in the cab on MacDon M155 Self-
Propelled Windrowers, model year 2014 and earlier. Installation instructions are provided in this
document. A list of the parts included in the kit is provided at the end of the document.
The following special tools are required:
• Hydraulic jack (or EnerPac
®
type lifting device
• Block of wood (2 x 4 x 5 in. [51 x 102 x 127 mm])
Installation Instructions
NOTES:
• In these instructions, right and left are determined from the windrower operator’s position, facing
forward with the windrower in cab-forward position.
• Unless otherwise noted, use the standard torque values provided in the windrower operator’s
manual or technical manual.
To install the Cab Isolation kit, follow these steps:
Replacing Front Shock Mounts
NOTE: Shocks and shock mounts must be removed one at a time.
1. Place a small hydraulic jack (A) on the tubular
axle frame near the side of the cab as shown
at right.
2. Insert a block of wood (B) between the floor of
the cab and the top of the bottle jack in order to
distribute the force of the bottle jack through a
larger surface of the cab floor.
3. Remove 1/2 in. flange lock nut on bolt (A). DO
NOT remove bolt at this time as the shock is still
under load.
4. Using the hydraulic jack, lift the cab until lower
shock bolt (A) is loose.
Figure 1: Jack under Front RH Side of Cab
Figure 2: LH Front Shock
M155 Self-Propelled Windrower Cab Isolation Kit MD #166759
INSTALLATION INSTRUCTIONS
169874 Revision C Page 3 of 38
5. Remove hardware at bottom (A) and top (B) of
shock (C), and then remove shock. Retain
shock, but discard hardware.
6. Remove shock mount hardware (A) and
mount (B). Discard.
Figure 3: LH Front Shock
Figure 4: Old LH Front Shock Mount
M155 Self-Propelled Windrower Cab Isolation Kit MD #166759
INSTALLATION INSTRUCTIONS
169874 Revision C Page 4 of 38
7. Install the new shock mount (MD #166605) (A)
in the same location using two 1.5 in. long
carriage bolts (MD #21469) and two flange lock
nuts (MD #50186) (B) provided in kit. Do not
tighten hardware at this time.
8. Install insulator (MD #166530) top (A) and
bottom (B) into shock mount (C) as shown.
HINT: Use soap to ease installation.
9. Insert spacer (MD #166539) (D) into
insulator bore.
Figure 5: New LH Front Shock Mount
Figure 6: New LH Front Shock Mount
M155 Self-Propelled Windrower Cab Isolation Kit MD #166759
INSTALLATION INSTRUCTIONS
169874 Revision C Page 5 of 38
10. Insert shock channel weldment (MD #166579)
(A) into insulator.
11. Ensure bolt holes in shock (C) align with holes
in top mount (B) and bottom mount (A) before
tightening hardware in Step 12.
Figure 7: New LH Front Shock Mount Assembly
Figure 8: New LH Front Shock and Shock Mount
Assembly (Front Frame Cross Member Support and
Front Lower Panel Removed for Clarity)
M155 Self-Propelled Windrower Cab Isolation Kit MD #166759
INSTALLATION INSTRUCTIONS
169874 Revision C Page 6 of 38
12. With alignment verified, torque mount hardware
(A) to 54–59 ft·lbs (73–80 N·m).
13. Install mount flat washer (MD #166532) (B) and
flange nut (MD #50225) (C). Do not torque nut
(C) at this time.
14. Install shock (A) in new shock mount with one 3
in. long hex head bolt (MD #21560) (B) and one
flange lock nut (MD #50186) (C) provided in kit.
The bolt head must face the center of the frame.
Do not tighten.
15. Attach shock to top mount with one 2.75 in. long
hex head bolt (MD #21880) (D) and one flange
lock nut (MD #50186) (E), both provided in kit.
The bolt head must face the outer frame.
Torque both flange nuts (C and E) to 54–
59 ft·lbs (73–80 N·m).
Figure 9: New LH Front Shock Mount Assembly
Figure 10: LH Front Shock Installed in
New Shock Mount
(Front Frame Cross Member Support and Front
Lower Panel Removed for Clarity)
M155 Self-Propelled Windrower Cab Isolation Kit MD #166759
INSTALLATION INSTRUCTIONS
169874 Revision C Page 7 of 38
16. Lower and remove the bottle jack, then torque
the flange nut (A) to 75–80 lb-ft (102–108 N·m).
HINT: Use a large crescent wrench or pry bar to
prevent channel from rotating as shown at right.
17. Repeat Steps 1–16 on the other side of the cab.
Figure 12: Tightening Nut
Figure 11: LH Front Shock Installed in
New Shock Mount
(Front Frame Cross Member Support and Front
Lower Panel Removed for Clarity)
M155 Self-Propelled Windrower Cab Isolation Kit MD #166759
INSTALLATION INSTRUCTIONS
169874 Revision C Page 8 of 38
Replacing Side Stabilizing Members
1. Beneath the cab on both sides are stabilizing
members (A). On one side, remove hardware
(B), (F), and (G), and then remove link supports
(C) and (D). Discard.
HINT: Pushing cab rearward will assist with the
removal of (F). With (F) removed, allow cab to
shift forward to ease the removal of bolt (G) and
link supports (C) and (D).
2. Remove the rear mounting bolt (E) that attaches
the stabilizing members to the cab.
3. Remove cab stabilizing member (A). Discard.
4. Remove link support (A) and nuts from the
bottom of the cab. Discard.
5. Replace the old link support with the new rear
link support (MD #166641) provided in the kit.
Attach with the new flange lock nuts
(MD #50186) provided in the kit. Torque
hardware to 54–59 ft·lbs (73–80 N·m).
NOTE: New rear link support has an
identification notch on each side (see illustration
on next page).
Figure 13: Old LH Stabilizing Membe
r
Figure 14: Old Rear Link Support
Figure 15: New Rear Link Support
M155 Self-Propelled Windrower Cab Isolation Kit MD #166759
INSTALLATION INSTRUCTIONS
169874 Revision C Page 9 of 38
A – Identification notch
6. Install new front link support (MD #166639) (A)
and link support (MD #166640) (B) in place of
old link supports. Fasten in place with two
1.25 in. long carriage bolts (MD #21471) and
two lock nuts (MD #50186). Bolt threads should
face away from cab. Do not tighten.
NOTE: New link support has an identification
notch on one side (see illustration on
next page).
7. Attach new stabilizing member (MD #183209)
(C) to front (A) and rear (D) link supports with a
60 mm long metric hex head bolt (MD #152274)
and a metric hex flange nut (MD #136036) (E) at
each end.
Nut must face away from cab.
Figure 17: New Stabilizing Member Installed
Figure 16: New Rear Link Support (MD #166641)
M155 Self-Propelled Windrower Cab Isolation Kit MD #166759
INSTALLATION INSTRUCTIONS
169874 Revision C Page 10 of 38
A – Identification notch
8. Torque hardware (A) to 54–59 ft·lbs (73–
80 N·m).
9. Torque hardware (B) to 25–35 ft·lbs (34–
47 N·m).
10. Repeat Steps 1–9 on the other side of the cab.
Figure 19: Link Support Hardware
Figure 18: New Link Support (MD #166640)
M155 Self-Propelled Windrower Cab Isolation Kit MD #166759
INSTALLATION INSTRUCTIONS
169874 Revision C Page 11 of 38
Replacing Center Stabilizing Member
1. Beneath the cab is a lateral stabilizing member
which is mounted to the cab floor and to the
right side of the frame.
Remove the hardware (A) connecting the
stabilizing member (B) to the frame. Discard
hardware.
2. Remove the hardware (A) connecting the
stabilizing member (B) to the center link support
(C), and then remove the stabilizing member
(B). Discard.
3. Remove the hardware (D) connecting the center
link support (C) to the cab, and then remove the
center link support (C). Discard.
Figure 20: Old Center Stabilizing Membe
r
Figure 21: Old Center Stabilizing Membe
r
Figure 22: Old Center Link Support
M155 Self-Propelled Windrower Cab Isolation Kit MD #166759
INSTALLATION INSTRUCTIONS
169874 Revision C Page 12 of 38
4. Install new center link support (MD #166642) (A)
with existing welded bolts and two flange lock
nuts (MD #50186) (B) provided in kit. Torque to
54–59 ft·lbs (73–80 N·m).
NOTE: The new stabilizer mount has
identification notches ([A] in Figure 24 below).
5. Install new stabilizing member (MD #183209)
(C) with one 60 mm long metric hex head bolt
(MD #152274) and one metric hex flange nut
(MD #136036) (D) at each end. All parts are
provided in kit. Torque to 25–35 ft·lbs (34–
47 N·m).
6. Install new side link support (MD #166644) (A)
on the windrower frame with two 1.25 in. long
carriage bolts (MD #21471) and two flange lock
nuts (MD #50186) (B) provided in kit. Torque to
54–59 ft·lbs (73–80 N·m).
7. Attach new stabilizing member (C) to side link
support (A) with one 60 mm long metric hex
head bolt (MD #152274) and one metric hex
flange nut (MD #136036) (D) provided in kit.
Torque to 25–35 ft·lbs (34–47 N·m).
Figure 23: New Center Stabilizing Membe
r
Figure 25: New Center Stabilizing Membe
r
Figure 24: Center Link Support (MD #166642)
M155 Self-Propelled Windrower Cab Isolation Kit MD #166759
INSTALLATION INSTRUCTIONS
169874 Revision C Page 13 of 38
Removing Rear Shock Supports
NOTE: Shocks and shock supports must be
removed one at a time.
1. Place blocks (A) on the lower frame flange and
position it beneath the cab.
2. Place the jack (B) on the blocks. Place a block
of wood (C) on top of the jack.
3. Remove 1/2 in. flange lock nut that holds the
bolt at (D) on inside of frame from bolt.
Do not remove bolt (D) at this time as the
shock is still under load.
4. Using the jack, lift the cab until bolt (D) is loose.
For additional safety, place blocks (E)
between the windrower frame and the cab.
IMPORTANT: Damage to air conditioning
lines may occur if cab is lifted too high.
5. Remove the bolt at (D).
6. Remove the nut (A) connecting the rear upper
shock support (B) to the rear panel of the cab.
Figure 26: Jack on Rear Frame Flange
(Top: LH Side, Bottom: RH Side)
Figure 27: Old LH Rear Shock and Shock Support
(Left Lower Post of Cab Removed for Clarity)
M155 Self-Propelled Windrower Cab Isolation Kit MD #166759
INSTALLATION INSTRUCTIONS
169874 Revision C Page 14 of 38
7. Inside the cab, under the training seat, the
Windrower Control Module (WCM) cover (A)
must be removed.
Pull up the cab insulation (C) to gain access to
the cover hardware (B), then remove the
hardware and the cover (A).
8. Remove WCM (A) from the cab wall.
NOTE: Do not unplug the WCM harness (B).
Figure 28: WCM with Cove
r
Figure 29: WCM with Cove
r
Figure 30: WCM with Cover Removed
M155 Self-Propelled Windrower Cab Isolation Kit MD #166759
INSTALLATION INSTRUCTIONS
169874 Revision C Page 15 of 38
9. Pull back floor mat and remove plastic cap (A).
10. Remove floor mount nut (A) and discard.
Figure 31: Beneath WCM
Figure 32: Beneath WCM
M155 Self-Propelled Windrower Cab Isolation Kit MD #166759
INSTALLATION INSTRUCTIONS
169874 Revision C Page 16 of 38
11. Remove rear upper shock support and shock.
12. Disconnect shock (A) from old shock support
(B). Discard support and hardware, but retain
shock.
Figure 33: Old LH Rear Upper Shock Support
and Shock
Figure 34: Rear Shock and Shock Support
M155 Self-Propelled Windrower Cab Isolation Kit MD #166759
INSTALLATION INSTRUCTIONS
169874 Revision C Page 17 of 38
13. Install insulator (MD #166530) (A) and spacer
(MD #166539) (B) in new left shock support
(MD #166695) (C) as shown at right. All parts
are provided in kit.
HINT: Use soap to ease installation.
14. Install new shock support onto cab.
You will need to remove approximately 2-
9/16 in. (65 mm) of foam insulation (B) from the
rear cab wall to fit the new parts in place.
Torque hardware (A) to 54–59 ft·lbs (73–
80 N·m).
Figure 36: Inside Rear Panel of Cab
Figure 35: New LH Rear Shock Support
M155 Self-Propelled Windrower Cab Isolation Kit MD #166759
INSTALLATION INSTRUCTIONS
169874 Revision C Page 18 of 38
15. Reinstall plastic cap (A) and floor mat.
16. Reinstall WCM, cover (A), hardware, and wall
insulation.
Figure 37: Beneath WCM
Figure 38: Beneath WCM
Figure 39: WCM Reassembled
M155 Self-Propelled Windrower Cab Isolation Kit MD #166759
INSTALLATION INSTRUCTIONS
169874 Revision C Page 19 of 38
17. Attach shock assembly (A), removed from
windrower in Step 10, to channel weldment
(MD #166579) (B) with a 3 in. long hex head
bolt (MD #21560) (C), flat washer (MD #18599)
(D), and a flange lock nut (MD #50186) (E). All
parts are provided in kit.
18. Torque hardware to 54–59 ft·lbs (73–80 N·m).
19. To install rear shock assembly into mount, insert
bolt (A) on the top of the rear shock assembly
(B) through the spacer in the top of the shock
mount assembly (C) as shown at right.
The bottom of the shock assembly (B) fits into
the shock support (D) on the windrower frame.
Figure 41: Rear Shock Assembly in
LH Rear Shock Mount
(Left Lower Post of Cab Removed for Clarity)
Figure 40: Rear Shock Assembly
M155 Self-Propelled Windrower Cab Isolation Kit MD #166759
INSTALLATION INSTRUCTIONS
169874 Revision C Page 20 of 38
20. Install flat washer (MD #166532) (A) and flange
nut (MD #50225) (B) onto bolt protruding from
top of rear shock mount assembly (C).
21. Torque flange nut (B) to 75–80 ft·lbs (102–
108 N·m).
HINT: Use a large crescent wrench or pry bar to
prevent channel from rotating.
22. Using the jack, lower the cab until the hole in
the bottom of the shock lines up with the hole
(A) in the shock support.
Figure 43: Shock Support
Figure 42: Rear Shock Assembly in
LH Rear Shock Mount
(Left Lower Post of Cab Removed for Clarity)
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