Gradall XL3100IV, Operators Safety Manual

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Section 3 - Operation
3-12 80804002
Differential Lock
Normally, differential lock will engage and disengage immediately in response to
lock/unlock toggle; however, differential “wind-up”, or misalignment can delay
engagement/disengagement. In this event, reversing direction of travel and/or
operation of steering while traveling may relieve differential “wind-up”. Indicator light
shows actual state of lock engagement/disengagement.
• The differential can be locked or unlocked when the vehicle is standing still or at
a constant low speed when wheels are not slipping. Notice!: Engaging the
differential lock while the wheels are slipping may cause damage to the
differential.
• Lock the differential and operate the vehicle only at low speeds on poor road or
highway surfaces or when digging over the side.
• When differential is locked, the turning radius will increase.
• Unlock the differential when need for maximum traction has passed or when
traveling on good surface.
• Do not lock differential when the vehicle is traveling down steep grades and
traction is minimal. Potential loss of stability can result.
Locking the Differential: When encountering poor traction conditions, perform the
following:
1. While stopped or traveling straight at a constant speed and no wheels slipping,
move differential lock toggle to locked position.
2. Let up momentarily on accelerator allowing differential to fully lock.
3. When differential is fully engaged, the indicator light will illuminate.
Unlocking the Differential: After poor conditions have passed, perform the
following:
1. Move differential toggle to unlock position.
2. Let up momentarily on accelerator allowing the differential to fully unlock.
3. When differential lock is fully disengaged, the indicator light will no longer
illuminate.