I bought a 2001 Bobcat 773. This is my first one and I do not know much about them. Last week, the hydraulic fluid starting pouring out of the arm and I was told it blew the seal. I'm trying to remove the arm so I can get it re-packed. The top pin came out but the bottom arm pin will not move. Is there any way I can remove it? I'm about 100 miles from the dealer and they charge $100 an hour to come out.
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what are you calling a lower arm pin , what cylinder are you working on , the ones that booms the machine up or the one that makes the bucket tilt --------- I think you mean the boom cylinder , if so you don't need to take that pin out to reseal the boom cylinder
skidsteer.ca
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Yes just remove the pin at the rod end of the cylinder and leave the barrel end attached. This way the cylinder is held secure so you can un screw the gland nut and pull the rod and piston out. Install the new seals the way the old ones are and put it back in.
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HarryN
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Interesting...would love to see a video of someone doing the seals. Anyone have one?
Harry -----I see your right around the corner from me , I live in Lacombe , don't have a video for you on resealing a cylinder , but if you ever have a cylinder to do you could see it in person , I am a mobile heavy equipment mechanic since 1976 that will come to your site and do it for you , I have a shop on wheels and I am building a bigger better one right now , I worked for Boh Brothers and B+G Crane and was the service manager for Kastner Rentals for many years , Tuff Equipment was Kasnter Rentals , now it is Volvo Rents , I'll do all types of contruction equipment , Cat , Deere , Komatsu , Case , Takeuchi , what ever , Bobcat is my bread and butter ------------------------ to do a boom cylinder on the vertical lift booms you install the safety bar on the opposite side of the cylinder you want to do , it helps to have an extra boom support if it is the opposite side that the boom support is mounted on the machine that you need to do , after the boom is support in the up position , loosen the bottom hose going to the cylinder to relieve any pressure and suction so the rod will pull out the casing easily , unscrew the gland nut , you either use a pin spanner wrench or if it is not frozen in there a large pair of channel locks will surfice , unpin the chrome end of the rod , take out the grease fitting as you need as much room as you can get and you can pull the rod out the casing ----------------- if the gland nut and or piston nut is not rusted or galled I could drive to Covington and reseal the cylinder in 2 hours ----------- there is always a worst case seniro and maybe 1 in 10 heat may need to be applied to the casing to loosen the gland ,I have had a few really bad ones where the cylinder has to be removed and taken to a machine shop and the gland nut cut from the casing in a lathe , threads reshaped and a new gland nut /head installed
Sorry about the late reply. I had to have an angiogram. The lift arm on the left side is where the fluid was pouring out. I lifted the bucket then set it up on top of sandbags so the bucket is about 4 feet off the ground. Then I removed the hydraulic lines and the top arm pin. The only thing now is the pin on the bottom will not come out. A friend of mine welding a threated bolt to the pin on the outside and then welding a plate with a nut on the other side of the bolt to pull it out but the 5/8 in bolt broke. Is there a way to pick up the cab so that I can pound the pin from the inside of the Bobcat or any other way that might work? Is the any way to attach a picture to a reply?
can't imagine why the pin won't come out ..not that familiar with the 773 but all of the bobcats I've owned and worked on have a 3/8 bolt and nut retaining the pivot pins .if you are not seeing this bolt it is possible that it is on the other .end ..inside of the machine ..hopefully someone with 773 experience will chime in here and help you out.
I was able to remove the 3/8" bolt and nut going through the pivot pin but the large pivot pin is what I'm trying to remove. Maybe, I'm doing this all wrong but I was told that I to remove the cylinder and I had to remove the two pivot pins on the arm to get to the cylinder.
i'm looking at a pic of the 773 ..from what i can see you need to remove the pins at the top and bottom of the hydraulic cylinder ..i don't see a reason to remove any pins from the arms.. you might need to raise the arms up high enough to get the cylinder clear but i still don't see a reason to remove any arm pins.
clarify my last post ....the upper hydraulic cylinder pin also goes thru the arm ..the lower pin for the cylinder is to the rear of the machine behind the tire ..i don't see the need to remove any of the arm pivot pins .
Its picture time. If this is the cylinder you need to repair, knock out the top pin, (top arrow) and then unscrew the gland nut (bottom arrow) and the cylinder rod, gland nut, et al can be removed. The barrel stays in the machine.
For some reason the picture won't post. Just go to the link. Sorry.
The black cylinder with the silver rod is what I need to remove so I can bring it to have a new seal put in. The top pin has been removed but the only way I see to remove the black cylinder is to remove the bottom pin holding the cylinder. The bottom pin is the one that will not move. Is this the correct way to do it? Thanks,
