Technical information

imposing an excessive force on the position sensor. The force is great enough to loosen

the lock nut on the position sensor and allow the sensor to rotate.

Fix

The peak-peak displacement of the axle bolt was measured, throughout the joints range of

motion, and compared to the flexible range of the coupling. It was decided that the

potentiometer may be able to physically withstand the increased frictional force if it was

restrained. Although the lifetime of the part may be reduced, restraining the

potentiometer is the most cost effective solution at this time. The potentiometers were

fixed to there mount using a Loctite brand hardening epoxy. The system was tested and

physical movement previously observed between the potentiometer and mount was not

detected.

May 2001

Report

The right joystick is not responding.

Problem

The machine runs fine from the left joystick. The right joystick is determined to be

defective.

Fix

The joystick was sent to the factory for repairs.

November 2001

Report

The joint between the short arm and the long arm broke.

Problem

The axle bolt was broke during operation. It is unclear how or why the joint was

damaged; however, it is assumed that the operator may have caused the precrush door to

close on the joint causing the damage.

Fix

The joint was disassembled and a new axle bolt was fabricated. The axle bolt is a grade 8

bolt that is modified to interface with the position sensors. The joint was reassembled

and the position sensor calibrated.

February 2002

Report

There is low clearance between the clamshell and the dump body. In addition, automated

motion is being halted and responding erratically.

Problem