450c stops moving

[andyvt]

This happens when under load like climbing a rise while pulling a load or pushing something heavy. The engine speed doesn’t change, the dozer just stops. It happens in forward and reverse, hi or lo range.
The dozer will move right along under open flat conditions.
I have done full fluid and filter service but this issue was happening before I did it.

[Jim B]

Does it make a difference if you shift to #1 Low? A slipping clutch will slip more the higher the gear.

Your 450C has a typical engine clutch as well as the hydraulic clutches in the engine. Do the checks and adjustments for the engine clutch on through the transmission clutch valve by the manual and see what happens. If that doesn't help, do the pressure checks for the HLR.

[andyvt]

It does it in lo as well as hi and reverse.
I haven’t done any diagnostic tests yet as I’m using it right now on a logging job.

[Jim B]

I understood you that it did this in lo, hi, forward, and reverse. I asked about in #1 in the 4 speed gearbox. What gear are you running in?

[andyvt]

My mistake, I have always been running in #2 and have not tried in 1

[andyvt]

I understood you that it did this in lo, hi, forward, and reverse. I asked about in #1 in the 4 speed gearbox. What gear are you running in?

So I put it in #1 and it seems to run normally but I didn’t give it a really heavy load test yet. I will give it a workout today as I have a big hitch waiting for hauling.

[andyvt]

When operated in #1 it did not slip even with a big hitch in really rough and muddy conditions.

[Jim B]

Engine clutch may be slipping, it would affect hi, lo, and reverse. The other thing is you should check pressures.