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| Illustration 1 | g01622994 |
(1) Typical "VM" variable gauge cylinder | |
Hydraulic cylinders expand the undercarriage and the hydraulic cylinders retract the undercarriage. Expanding the width of the undercarriage will increase the stability of the machine. Retracting the cylinders makes transportation of the undercarriage easier.
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| Illustration 2 | g01627471 |
The upper structure that is perpendicular to tracks | |
Note: Travel the machine during an adjustment for the variable gauge undercarriage. Swing the upper structure of machine until the upper structure is perpendicular to the tracks. In this position, machine weight is evenly displaced across the undercarriage.
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| Illustration 3 | g01623269 |
(2) Left locking pins (6) Right locking pins | |
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| Illustration 4 | g01623374 |
(2) Left locking pins (6) Right locking pins | |
Note: Each track frame is able to be locked in position by pins. The pins are mechanical locks for the track frame in either the minimum track width or in the maximum track width. The pins can be inserted in a LOCKED position for the left side track or the right side track separately. By locking the left side track frame or the right side track frame, individual extension or retraction of the track frames can be performed.
To perform an adjustment to the undercarriage, remove locking pins (2) and (6) and travel the machine. While the machine is traveling, use the operator controls to adjust the undercarriage. If only one side needs extended, remove only one side of the locking pins. There are two hydraulic cylinders that control the width of the undercarriage. After the undercarriage has been adjusted, stop the machine and install locking pins (2) and (6).
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| Illustration 5 | g01623231 |
325 Variable Gauge Undercarriage (cylinder extend) (3) Variable gauge cylinders (4) Locking valves (5) Swivel | |
Note: While locking pins (2) and (6) are removed, variable gauge cylinders (3) will extend in unison and the cylinders will retract in unison.
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| Illustration 6 | g01624172 |
(3) Variable gauge cylinders | |
During an undercarriage adjustment, oil flows from the pump to the following components: swivel (5), locking valves (4) and variable gauge cylinders (3) .
Oil flow from swivel (5) flows to locking valves (4). Oil flows from locking valves (4) to the head end of variable gauge cylinders (3). Return oil from the rod end of cylinders (3) returns to locking valves (4) and to swivel (5) .
Note: Locking valves (4) hydraulically lock variable gauge cylinders (3) in place when an undercarriage adjustment is not needed.