Guardian Suspension
Slippage
Lawrence Trosen
3/20/2009

Description of Issue
Friction fit assembly
– Square spring plate
needs to remain
stationary for
suspension to function.
Due to recent riser-bolt
tightness, operators were
instructed to add grease to
the top of the spring to
smooth out the cranking
process

Exposure
• Operators were instructed to add grease
about 3 weeks ago
• 594 suspensions have been built since
2/1/09

Exposure
Guardian Suspensions Sent by Customer 2/1/09 - 3/19/09
250 120.00%
100.00%
200
80.00%
150
Amount Sent
Amount Sent
60.00%
Cumulative %
100
40.00%
50
20.00%
0 0.00%
X
ks
l
ks
M
lvo
up
c
s
20
S
ba
AU
In
r ie
JD
SP
or
or
ro
Vo
lo
st
up
D
tW
W
G
G
du
se
O
ro
e
s
H
or
IB
Ca
In
ct
G
qu
CN
np
TH
du
on
d
bu
te
ve
ro
D
RE
Du
i
Un
Da
tP
ac
E
e
n
M
o
DE
er
ne
C
De
po
&
HN
m
hn
e
JO
er
Co
Jo
De
Customer

Exposure
Guardian Suspensions Sent by Date & Customer 2/1/09 - 3/19/09
JOHN DEERE THIBODAUX
John Deere Dubuque Works
80
272
Component Products Group
70
60
CNH Global
50
ount Sent
JDM
40
20
Am
30
Case SPS
20
Volvo
10
United Group Inc
0
9
9
9
09
09
09
09
00
00
00
20
20
20
20
/2
/2
/2
Mac Don Industries
2/
2/
9/
9/
16
23
16
3/
2/
2/
3/
2/
2/
3/
Date
Deere & Co Davenport Works

Exposure
Mac Don
200
Miles CNH
Volvo
Deere
United
1000
Miles

Repair Method
• Tried:
Does not
– Wiping with cloth (no disassembly) Fail function
Does not
– Steam cleaning (no disassembly) Fail remove
grease
– Spraying Brake Cleaner Fail Harms
Paint Job
– Compressed Air Fail Does not
function
– Disassembly & Wipe Clean Fail Takes too
Long

Repair
Best Method:
Add Lubrication to
the bolt/spring
plate nut
assembly. Run
suspension up and
down several
times.
Friction in bolt
assembly
becomes less than
that in the
spring/spring
washer assembly.

Decide
• Alert customers of issue and repair all
suspensions in the field
• Do not alert customers of issue and repair
through warranty claims.