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Sounds like worn out clutch/friction discs. No easy way around it.

I believe he is the wrecker in Kalispell JWB was referring to earlier in this thread. I paid $1,500. Every bushing was worn out, center pin was super loose and there were no lift cylinders.

The 420C clutch/brake mechanism is meant to be dry. If use will not break it loose, you must disassemble the unit. No liquids in the clutch housing.
Best regards,
Bruce

slabguy wrote: ↑

Sun Sep 01, 2019 12:32 pm

Ended up being fuel. See pic for the culprit. I haven’t read in to this yet but this wire broke that goes to a fuel control valve (not sure what it’s really called). Maybe controlled while key is on or something. Not real sure.

https://imgur.com/a/bFIzc1X

Fuel solenoid, I think

I need a couple myself, one for a 450E widepad and one for a 450 narrow pad. I cleaned out a Kalispell Montana wrecker of all his stock in April. Doesn’t sound like they plan on buying any more older dozers for wrecking so might have to drive a bit further to find them. I found some in Washington s...

Consider adding a location to your forum info. This can be helpful

Vander Haags in Spencer, Iowa has one. They are trying to sell it on EBay by the piece. There are pics, search 1978 450c cylinder. Super $$$ as Vander Haags always is, but the blade look In good nick.

Best regards, Bruce

Yes. The hydraulics that operate the piston or diaphragm is a blind end system , so I would cycle bxt free spool and wind in to fully circulate the Seafoam.

Time for some Seafoam to help with the moisture. And a short cycle fluid/filter change.
Best regards, Bruce

There are many parts that are shared by those machines. Look carefully at comparison pics. How many pieces of the donor machine would you need to use to pay for the donor purchase price? Not only are parts $$$, 40 yr old industrial parts are getting harder to find. This is why I have two donor machi...

I would remove the bottom cover on the right side and clean the small intact screen on the pump. This small screen can easily get slugged with slime and stall the pump. There is a pressure test port on the bottom of the right side. Should have 1,000 psi give or take..

Did you run the machine without the fuel cap? What was the result? Is the air cleaner/filters unobstructed? Correct supply and return fuel lines come from the front of the tank. There should be a sump with a drain to get rid of moisture and debris. This is a great time to service the sump if it is n...

Send an email to Lavoy!

Try running the machine with the fuel cap loosened or off(in clean conditions). I'm not sure what series 450 you have? Loosening the cap will isolate the fuel tank vent tube and it's function. You need to search this forum for "mouse turds". Some internal components in the injection pump(IP) can bre...

Ex forestry machine can be bad b/c they may have had many different operators (good, bad inexperienced etc). But these machines usually had lower hours and no expense spared with the tax payer dollars!! The winch is powered by a winch drive that exits the rear of the machine. There is a splined coup...