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HN
®
FR Series
AUXILIARY SPRING ASSEMBLY
A visual inspection of the auxiliary spring is required every three months. It is acceptable to
have some scuffing on the bottom edges of the auxiliary spring due to contact with the bolster
springs and/or Vee bracket. If the auxiliary spring is damaged, replace the auxiliary spring as
outlined in the Component Replacement Section of this publication. See the following chart
for the new unloaded auxiliary spring height. If the minimum unloaded height decreases than
shown in the chart replacement is required, see Figure 6-8.
FIGURE 6-8
Preventive Maintenance
Pro Gear and Transmission • 906 W. Gore St. Orlando, FL 32805 • 1 (877) 776-4600 / (407) 872-1901 • parts@eprogear.com
■
Minor oil and grease contamination in the rubber due to vehicle operation is accept-
able. A slight change in shape of the rubber due to permanent set should not be
mistaken for oil and grease contamination. Certain softening of the rubber surface is
acceptable. However, unacceptable swelling due to contamination will require bolster
spring replacement. Measure bolster springs in the unloaded state. If the rubber diam-
eter of the bolster spring exceeds 8¾" (222.3 mm), see Figure 6-7, then bolster spring
replacement is necessary.
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Cuts or Splits in the rubber of over 3.0" (76 mm) in length and an average depth of
1.0" (25.4 mm) are not acceptable and require bolster spring replacement. In par-
ticular, look for signs of cuts or splits in the rubber at points indicated in Figure 6-7 as
"///////".
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Bonding separation of the rubber from a bonded metal surface to a depth of up to
1½" (38 mm) is acceptable. If any bonding separation is more than 1½" (38 mm)
deep, both bolster springs should be replaced on the affected side of the vehicle (see
Figure 6-7). An unloaded bolster spring may be inspected for any bonding separa-
tion by measuring at points indicated in Figure 6-7 as "///////". Any thin film or other
residual rubber material on the metal plates resulting from the molding process may
be ignored during inspection.
FIGURE 6-7
Auxiliary Spring
Bolster Spring
Rebound Strap
16
8¾" (222.25 mm) Maximum
Minimum
Part
Height Unloaded
Number
or
A
B
A
60314-000
B
65902-003
Vee Bracket
1½"
(38 mm)
Auxiliary Spring
Minimum
Unloaded
Unloaded
Height
Height
3
3
⁄
"
3.0"
8
(85.7 mm)
(76 mm)
1
15
2
⁄
"
1
⁄
"
8
16
(53.9 mm)
(49.2 mm)
17730-285
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