gemdozer wrote:

The D4 7U have 1 plug under the flywell and one for the transmission and bevel gear together and have one plug each side final drive inspection cover and one under each stering cluch and it is the same plug L-827..
 

The part number helps ... not sure I have seen this under the machine where described but will look again when I am at the property ...

that oil is knackered it shouldnt be brown. it should be a dark honey colour even when yrs old.

a point to remember the threads on these old cats are SAE so all fittings should be NPT or NPS. bsp threads are the same tpi for some sizes but wont seal as the thread angle is different.

Did some maintenance and now the dozer won’t push like it use to.

removed wench
mounted and replaced left drive clutch brake pads 
removed radiator, cleaned, reassembled, put back on machine 
Flywheel brake adjusted 1/2 turn to better stop the flywheel when shifting 

worked good for one full day pushing the same massive amounts it did prior to maintenance then it can barely push 1/4th the load it previously did 

any thoughts on what I should check ? 
We bled the injectors and pump when firing up ... don’t think there is air in the line 

all fluids are topped off and smell fine 

is the clutch slipping? is the fuel pressure and fuel filter ok? does the vent on the fuel cap work?

bursitis wrote:

is the clutch slipping? is the fuel pressure and fuel filter ok? does the vent on the fuel cap work?
 

How would I check for a slipping clutch? 

Fuel pressure is identical to what it was prior to maintenance. Vent should be working. 

in your post above it said you adjusted the clutch brake. could you have inadvertently loosened the main clutch? does the engine pull down? loose rpm smoke etc or does the dozer just slow down and won't push? is the brake band you replaced binding?

Hi Team,
the main clutch lever should have approximately 35 Lbs. or 15Kg. effort to pull the lever over center to the lock position and is measured just below the handle with a spring balance.

Hope this helps,
Cheers,
Eddie B.

Engine does loose power when pushing and it starts to bog down but only under a "normal" load ( ie before it started to act this way) ... most of the time when pushing a light load up hill the dozer will stop and the rpm will drop slightly less the front is pushing a "normal" load then it will bog down and I have to raise the blade, clutch forward, then pull back to get some movement again. 

The brake band isn't binding ... the machine ran good for one full day before the problems started to show up. 

I don't recall any place in the manual for adjusting the clutch brake where it would have loosened the main clutch ... 

Edb, Thanks for the checkpoint, I will get my manuals out when I am on site next and check for this ... I don't think it feels like 35 lbs but I could be mistaken. Seems easy enough to adjust the clutch but what is the specialized tool mentioned? I assume I can use a normal torque wrench when replacing the locking nuts

EDIT: previously saw a question about fuel filters ... all 4 were replaced a couple months back.
The only thing odd in the fuel system right now is when the governor is moved the mechanism it adjusts creaks now (it didn't before maintenance) 

Fuel filters are not a matter of time, but how much junk is in the the fuel. Very easy to get water if your not real careful. Also if you had the tank off to work on things you could of stirred up rust to break off the tank walls. The fuel filters are always a cheaper place to start.