TM-5-3805-254-14-P-2
TRUCK, DUMP, 20 TON, 6X4, ON-OFF HIGHWAY 71,000 GVW, IHC MODEL F-5070 (CCE)
TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, GENERAL SUPPORT AND DEPT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS INFORMATION AND SUPPLEMENTAL MAINTENANCE INSTRUCTIONS)
JUNE 1980
TM-5-3805-254-14-P-2 - Page 615 of 894
TRUCK SERVICE MANUAL
SPRINGS
DESCRIPTION
Constant Rate
Constant
rate
springs
are
leaf-type
spring
assemblies that have a constant rate of deflection.
For
example, if 500 lbs.
deflect the spring assembly 1 inch,
then 1000 lbs.
would deflect the same spring assembly
2 inches.
Thus, the rate of deflection is constant.
Constant rate springs are mounted to the axle with
U-bolts, nuts and lockwashers.
The front end of the
spring is mounted to a stationary bracket while the rear
end of the spring is mounted to a spring shackle.
The
shackle allows for variations in spring length during
compression and rebound of the spring.
This type of spring assembly is used in both front
and rear applications on IH vehicles.
Spring Shackles (Figs.
7
allow for
variations in spring length during compression
and rebound of spring.
Shackles pivot on either
lubricated spring bracket pins
Spring Bracket or Shackle Pins used on IHI
trucks will be one of the following three types.
2.
Pins that are driven into shackles or
brackets.
SERVICING
Although the exact servicing procedures are different
for each type of spring assembly and spring assembly
application, the basic procedures are similar.
The
following is a general out line for servicing all spring
assemblies used on IH vehicles.
Removal
1.
Place floor jack under truck frame and raise truck
sufficiently to relieve weight from spring to be
removed.
2.
Remove shock absorbers where used.
Fig.
7 Lubricated Spring Shackle (Driven-in
type spring pin).
TORQUE
CHART
FOR ASSEMBLY OF SUSPENSION U-BOLTS
ROLLED THREAD U-BOLTS
7/8"-14
225 - 275
1" -14
325 - 400
NOTE:
When servicing suspension assemblies, all U-
bolts
must be thoroughly cleaned and lubricated
with
Tectyl 400-CWD or equivalent before
reassembly.
608
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