GENERAL UNDERCARRIAGE
14 - 3
DESCRIPTION
D32E-1 track frame has five track rollers attached to it. The remaining models have six track rollers attached to it. The
track spring housing is a permanent welded part of the track frame, with the heavy coil spring being trapped within it.
The track frames are attached at the rear to the rear rigid bar and at the front by the front crossbar. The rear rigid bar
and crossbar mount in the main frame. A track adjuster and front idler are located between the two channels of the track
frame and slide back and forth to take up shock loads and for adjusting the track chain tension. The top idler on each
side is mounted in a bracket welded to the track frame.
FRONT IDLER - 11
The front idler provides a freely rotating, guiding support for the track chain. The front idler is supported on replaceable
wear bars which slide on the track frame channels. This sliding feature helps protect the track frame components by
allowing the track spring to absorb shock loads. The front idlers are heat treated steel castings and rotate around
bushings. The front idlers are equipped with metal type face seals which maintain a leak and dirt proof seal.
TRACK ADJUSTER - 17
The hydraulic track adjuster is contained in the front idler fork. Lubricant is introduced into the adjuster by the use of a
lubrication fitting on top of the fork. This lubricant acting upon the piston and fork forces the idler fork and front idler
forward for track chain adjustment.
TRACK SPRING - 16
A heavy coil spring is provided in each track frame . They permit the front idlers to recoil under shock loads and exert
tension on the track in normal operation. Each track spring is contained in a welded housing, which is a permanent part
of the track frame. The track spring is compressed and trapped in the ends of the housing between a front and rear
seat. The rear of the track adjusting rod bears against the track spring front seat.
TRACK TOP IDLER - 10
The upper section of track chain between the sprocket and the front idler is supported by a top idler. The idlers are
mounted in brackets which are welded to the track frame. The top idlers revolve around tapered roller bearings which
ride on heat treated replaceable steel shafts. The idlers are sealed against leakage and dirt by a metal type face seal.
TRACK ROLLER - 9
Track rollers are attached to the underside of the track frame and carry the weight of the machine. The rollers are heat
treated steel forgings and rotate around bushings. The rollers are equipped with metal type face seals which maintain
a leak and dirt proof seal. The rollers are single flange type.
FRONT CROSSBAR - 8
The crossbar is fitted with pins to the main frame. The ends of the crossbar are bolted to the track frames
REAR RIGID BAR - 4
The rear rigid bar is a solid rigid type bar mounted to the main frame by the half cinch type blocks. The rear of the track
frames mount to the crossbar.
MAINTENANCE
The track links have only one wearing surface which contacts the track rollers, front idler and track idlers. It usually
becomes necessary to replace the pins and bushings before the links wear out, and it is a matter of judgement then
whether the links are good enough to justify a new set of pins and bushings. Only wear on the outside of the bushings
is visible. Wear on the pins and interior of the bushings is indicated by track stretch. The amount of wear can be
determined by measuring the pitch length of the track chain under tension and comparing it with the allowable pitch
lengths, refer to WEAR LIMIT CHECKS in this section.
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