The Forestry Forum

General Forestry => Forestry and Logging => Topic started by: BurkettvilleBob on April 18, 2017, 09:27:26 PM

Title: JD 450c dozer steering issue
Post by: BurkettvilleBob on April 18, 2017, 09:27:26 PM
I was dozing away this afternoon on a pretty steep hill, backing up the hill, pushing stumps down the hill. After a few passes the left steering lever would get soft and stop working correctly. I'd go back down to the flat and separate  stumps and push aside and the steering would go back to normal. Is something starving for fluid when on a hill?
Title: Re: JD 450c dozer steering issue
Post by: mike_belben on April 18, 2017, 10:41:33 PM
Start with your oil levels and sump screen.
Title: Re: JD 450c dozer steering issue
Post by: snowstorm on April 19, 2017, 06:27:12 AM
what do you call soft??? 450c clutches run in oil. dipstick is under the seat. dose it slip?backing up hill? one side or bolth? one side break to tight .discs wore out .hose leaking. the hose goes to the clutch pack. how fast dose it change direction at 1700rpm? it should be quick. not quite to the point of throwing you on to the hood but almost
Title: Re: JD 450c dozer steering issue
Post by: BurkettvilleBob on April 19, 2017, 12:06:07 PM
Soft like there is no resistance when you pull back. The trans isn't slipping, I know what that feels like. You have to really pull back on the left lever to steer. Only when backing up a hill though.
Title: Re: JD 450c dozer steering issue
Post by: snowstorm on April 19, 2017, 02:30:40 PM
The levers should pull easy until it engages the break. It's sorta like power steering but manual brakes . It will seem different in reverse. Parking brake is on is it? I have seen them left on and it acts strange. There is an adjuster for the brakes
Title: Re: JD 450c dozer steering issue
Post by: BurkettvilleBob on April 19, 2017, 05:42:25 PM
I know, it pulls easy all the back, like it's not engaging the brake at all, but only in these conditions. Right lever works fine.
Title: Re: JD 450c dozer steering issue
Post by: mike_belben on April 19, 2017, 10:04:18 PM
Is there some debris rolling around in the linkages?  Its pretty common for 50lbs of oil soaked rubbish to be under the seat.
Title: Re: JD 450c dozer steering issue
Post by: BurkettvilleBob on April 19, 2017, 10:07:33 PM
I cleaned all that out, plus that would be more likely to make something harder to move, not easier, keep the ideas coming though.
Title: Re: JD 450c dozer steering issue
Post by: g_man on April 20, 2017, 06:53:22 AM
Did you look at the steering brake linkages. Sounds like something gets misaligned and doesn't hit the brake lever for some odd reason when you are at a sever angle ??????????
Title: Re: JD 450c dozer steering issue
Post by: BurkettvilleBob on April 20, 2017, 08:12:25 AM
I will  give it a look.
Title: Re: JD 450c dozer steering issue
Post by: BurkettvilleBob on April 21, 2017, 10:15:58 PM
Looks like the left brake needs adjusting, it pulls back farther than the right.  I've had trouble getting both sides to "feel" the same in the past.
Title: Re: JD 450c dozer steering issue
Post by: coxy on April 22, 2017, 06:22:40 AM
my 350c is like that after putting in new brake bands one lever  always pulls back more than the other if I try to make them the same one brake is always to tight  if I remember right the book says 1-11/2inches  off the lever peg on the floor the brake should start to engage
Title: Re: JD 450c dozer steering issue
Post by: BurkettvilleBob on May 19, 2017, 08:37:47 PM
Adjusted the brakes and all was good until I spent more time on the hill. Then the steering started acting up again and the brake pedal went soft as well. After a few minutes on the flat the brake pedal was back to normal. What is going on here?
Title: Re: JD 450c dozer steering issue
Post by: coxy on May 20, 2017, 07:00:40 AM
try adjusting that brake a little tighter you will know if its to tight as soon as you move run it at low low rpm so you can here/feel it drag
Title: Re: JD 450c dozer steering issue
Post by: bushmechanic on May 20, 2017, 10:17:58 AM
Sure sounds like an oil level issue to me. Did you check the oil level in the transmission? The levers are hydraulic assist so you may be low on oil.
Title: Re: JD 450c dozer steering issue
Post by: snowstorm on May 20, 2017, 12:09:58 PM
On a 450 c.the steering is just moving a valve. Pull the lever far enough it pulls the brake band. Power steering manual brakes. The 450 b. Had power steering and brakes.i would b.s. k off on the brake
It will act different backing up hill
Title: Re: JD 450c dozer steering issue
Post by: Ford_man on May 21, 2017, 11:14:34 AM
My 450BC done the same thing. I finally pulled the filter out of the trans and kleened it  It works good now
Title: Re: JD 450c dozer steering issue
Post by: BurkettvilleBob on May 21, 2017, 04:15:04 PM
I don't know. The oil level is good, still squeaky clean, maybe 40 hours on the fluid and all filters. The brake adjuster on the left side seems to be maxed out and the freeplay isn't to spec, brake is supposed to engage at 5 inches of travel, it's at 6 right now. I called the local  guru from the jd garage, he said he'd come check it out.  I'll report back.
Title: Re: JD 450c dozer steering issue
Post by: coxy on May 21, 2017, 04:28:26 PM
sounds like a wore out brake band  I know on a 350c you can put the brake cam on backwards ( iv done it many times being in a hurry) and the band will be all the way adjusted tight and it don't work worth of crap  ;D  don't know if a 450c is the same has any one put brake bands in it
Title: Re: JD 450c dozer steering issue
Post by: snowstorm on May 21, 2017, 07:03:35 PM
Was that bill you talked to? If so he will know of anyone would
Title: Re: JD 450c dozer steering issue
Post by: BurkettvilleBob on May 21, 2017, 08:40:59 PM
That's what I'm afraid of Coxy, a worn out brake band. Do you have to tear the final drive off to change one? Imagine you would right. Yes Snowstorm, it was Bill. I don't know who is going to fill his shoes when he retires. Seems like he's the only one who really knows his stuff.
Title: Re: JD 450c dozer steering issue
Post by: coxy on May 21, 2017, 09:47:18 PM
I know nothing about a 450 but know JUST about everything about  a 350 I have 4 that work and 5 that are in pieces in a container for parts  :)
Title: Re: JD 450c dozer steering issue
Post by: snowstorm on May 22, 2017, 06:34:05 AM
brake band would come out thru the top. remove roll cage seat platform oil tank comes with it. not real simple