Hi all

i have 3 x Hyster 5.0DX one of which has just had a major diff/transmission failure. the following was received from the service company.

"spent a bit of time investigating your diff failure yesterday
my conclusion is chain of event -
spider gear thrusts bearing surface wore out first.then went steel to steel and quickly contaminating oil.
Pinion bearing then collapsed destroying crownwheel and pinion.

Have got results back from oil lab for 401 and 985 both with alerts on them for excessive wear and oil contamination

Have checked your oil on site, and strongly recommend you double check with your supplier that it is compatible with HYSTER spec that follows.

Hyster spec :- for differential
SAE 90
API GL-4

The oil you have on site and charted is
Mobil
85w-140
API GL-5"

Spec of oil is very similar. Hours on trucks range from 17000, 19000 (failed), 23000.

Is this an inherrent problem with these trucks?

Cost of failure so far $12500. Cost of investigation of remainder at least $5500 each.