Technical information

tanks were having problems equalizing due to plumbing complications. A

single tank was used in place of the dual tanks and new plumbing installed.

Concerns

• The spherical bearings on the end joints of the wrist actuator are showing

signs of excessive wear. Despite the structural work done to the azimuth joint

and short arm section, there is significant flexure present in the robotic arm.

Inspections of the arm should be conducted on a regular basis to identify any

cracks. Several of the actuator pins are free floating. Allowing the pins to

rotate without lubrication causes excessive wear. Therefore, the pins should

be checked periodically.

• The poppet valve isolates the dump body valves. However, when the valves

are needed, the poppet valve is opened providing pressure at the line side of

every valve. Hence, creeping is present. The result is undesired creeping of

the dump body components and periodic collision warnings issued by the

controller.

• The tailgate occasionally does not close properly. The operator should verify

that the tailgate is closed before driving the vehicle.