LULL 644D-34 HIGHLANDER

bindian · Jan 29, 2021

Thanks a bunch ISZ. I won't be doing any work at full reach and have decided to just leave the forks on it. The tractor will do all the grapple work. It can move around the big ones, just not lift them without flattened tires on front. The Lull is a beast.

1-15-21 Lull Hauling TWO 21 Foot Logs.jpg

hugs, Brandi

icestationzebra · Jan 30, 2021

Your welcome. They are a decent machine if you use them as intended. Lull was a little ahead of the curve with this machine and as a consequence many people didn't see the point of a light 6k machine so they didn't sell very well. But as we've seen the market for the smaller 5-6k machines is slowly growing in some markets. ISZ

bindian · Jan 30, 2021

Thanks. I tend to baby it and keep it away from soft ground. I already stuck it once. I am lucky to have a CAT E70 to pull it out. I do need to get under it and grease the u joints, as I hear popping from time to time. Not all the time.
hugs, Brandi

tractormech · Jan 31, 2021

You can probably source the trunnion bearing through any bearing supplier, if there's numbers on them. Getting the caps off can be a chore, so be warned. How are you certain that's the issue? Have you jacked the wheel up and shook it to see where the slack is? Do that and see if it's the trunnions or slack inside the planetary hub bearings. Do you see oil leaking on the inside of the hub? I have not pulled an axle or hub assembly on a 644 D 34 specifically but I've pulled a ton on 644 B machines, but they are a different series of axle. You can maybe pull the whole assembly without disassembling the planetary and change bearings. I think your slack will be in the planetary though, but I'm not there to look. There's less than 90 degrees of movement on the trunnions and the bearings are basically trapped in the race so they don't move enough to fail-just my experience. Check it out first. Good luck.

bindian · Jan 31, 2021

No hubs are leaking. Just every once in a while I hear a sound like metal binding. It comes from under the center of the machine. Like from a gearbox u joint. I haven't geased her yet. Overall the machine seems to have been well maintained.

My left front tire leans in. I jacked that wheel up and could not wiggle the tire at the top at all. What could that be? No odd sounds from the wheels or hubs. Where do I service the gear boxes? I was under there briefly and didn't notice any drain plugs.
hugs, Brandi

tractormech · Jan 31, 2021

bindian said:
No hubs are leaking. Just every once in a while I hear a sound like metal binding. It comes from under the center of the machine. Like from a gearbox u joint. I haven't gerased her yet. Overall the machine seems to have been well maintained.

My left front tire leans in. I jacked that wheel up and could not wiggle the tire at the top at all. What could that be? No odd sounds from the wheels or hubs. Where do I service the gear boxes? I was under there briefly and didn't notice any drain plugs.
hugs, Brandi

The little gear boxes have a vented plug in the top you take out and fill with 80w90 gear oil. My book says 80 ounces but I'm not sure they'll hold that much. There's a drain in the bottom of both gear boxes. There isn't an oil level plug on them-I don't know why that is but whatever. As far as wheel lean you'll have to hunt it down. How bad is the lean? If it's pronounced there's play somewhere. Jack it up again and Push in on the bottom of the wheel and see if it flops then. The slack would have to be the planetary hub bearings are loose or the trunnion bearings are bad-that's really the only places you can get that lean from.

bindian · Feb 1, 2021

I will jack it up and push in the bottom ASAP. Thanks.
hugs, Brandi

bindian · Jan 10, 2024

Do I have a fuel pump going out or do the injectors need cleaning. Everytime I head for the barn after moving logs, the Cummins 3B.9-C sputters a little at the same place every time, going up a very slight incline.

tractormech · Jan 10, 2024

That's a vague problem. That machine is old so there may be trash or most likely rust in the tank. Also the fuel line may be really old and have a hairline crack somewhere. Just to be sure you can put a new one on there. Thats inexpensive. I run an inline 5/16 fuel filter on the one I keep up. If you don't have a filter I'd get one. And keep a spare on hand. I buy the plastic ones you can see inside. You can see when it's getting clogged up and change it our. First, be sure there's plenty of fuel in the tank. Take the fuel line off of the lift pump and be sure it has good flow from the tank.. there's a screen in the lift pump under the fitting where the fuel line hooks up. Take the fitting off and look in there. It may be partially clogged. If not there's a spring in the lift pump that can break and it won't pump as much. Start with the simple things first

bindian · Jan 10, 2024

Propped the bonnet open today and traced the line back from the screw on fuel filter and found an inline filter. I will replace that real quick.

bindian · Feb 12, 2024

I changed the metal inline filter with a clear plastic one. Took a ride out to the log piles and back. She ran fine, but after checking the filter, there are numerous black flakes in the inlet end of the filter. Will a huge magnet attached to the bottom of the tank near the tank outlet help?
I am going to buy 3 or 4 more clear filters to swap out and see if the flakes diminish.
Also, don't think there is a lift pump, as the bottom of the tank is higher than the inline filter and I had a constant flow of fuel. I had to pinch the hose with a pair of pliers.
Thanks!

tractormech · Feb 13, 2024

bindian said:
I changed the metal inline filter with a clear plastic one. Took a ride out to the log piles and back. She ran fine, but after checking the filter, there are numerous black flakes in the inlet end of the filter. Will a huge magnet attached to the bottom of the tank near the tank outlet help?
I am going to buy 3 or 4 more clear filters to swap out and see if the flakes diminish.
Also, don't think there is a lift pump, as the bottom of the tank is higher than the inline filter and I had a constant flow of fuel. I had to pinch the hose with a pair of pliers.
Thanks!

The only access to the inside of the tank is at the fill point. You may get something in there but you need to be able to remove it for cleaning. It has a lift pump for sure on the side of the engine- that's where the fuel line hooks to. No telling how much rust is in the tank so I'd certainly keep filters on hand. You can bet that there's a lot of rust and trash in the tank. I've been changing out filters for years on the one I keep up. I'd keep the tankmas full as possible too- that helps with filter life.

Vetech63 · Feb 13, 2024

I have nothing to add. I'm just here for a hug.

bindian · Feb 13, 2024

tractormech said:
The only access to the inside of the tank is at the fill point. You may get something in there but you need to be able to remove it for cleaning. It has a lift pump for sure on the side of the engine- that's where the fuel line hooks to. No telling how much rust is in the tank so I'd certainly keep filters on hand. You can bet that there's a lot of rust and trash in the tank. I've been changing out filters for years on the one I keep up. I'd keep the tankmas full as possible too- that helps with filter life.

Will a magnet outside the tank help?

tractormech · Feb 13, 2024

bindian said:
Will a magnet outside the tank help?

I hadn't thought of that. It may help pull it to one spot but once it gets a certain amount of buildup it won't catch any more rust. And then how do you get the rust out? I would think a magnet in a mesh bag with a string or wire you could remove and clean would be a better option. That way you remove particles. Just a thought.

bindian · Feb 13, 2024

The problem would be getting the magnet inside the tank down low enough without it trying to stick to the side of the tank or opening. Also, the fuel inlet opening is about 4 foot from where the fuel lines are, since the right frame rail is one long skinny fuel tank.
I am starting to think adding a poly tank behind the cab will be the best long term fix. For now, it will just be R&R the inline fuel filter as needed.
Thanks.

bindian · Feb 23, 2024

The Lull was unloading some cedar logs today when I heard a loud bang beside and below me. Then the electric button up/down tilt quit working. Any ideas where to start looking?

tractormech · Feb 24, 2024

Did you lose all functions? Or just the fork tilt?

bindian · Feb 24, 2024

Everything else works. I just went out and tried pushing the button and the joystick to the left to move the carriage and that works. So just the fork tilt is not working.

tractormech · Feb 24, 2024

Do you hear any hissing noise from the control valve or rhe manifold under the seat? Any noise that wasn't there before the loud pop you say you heard? Is there a carraige fork tilt test port in the test ports behind the step to get in the cab?And do you have any pressure testing guages? Sent PM

LULL 644D-34 HIGHLANDER

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