We have a grove 35 ton made in England and recently we had the boom hoist cylinders removed and taken down to be re chromed and new seals put in. After getting crane back together and back on the job we received a call saying the hook was touching the building. The boom had leaked down. Well we finished the job out and took the crane back to our shop removed both cylinders once again and had them rebuilt again.. After putting the crane back together filtering the oil for countless hours and cycling all the controls and putting it back on the job i pulled the extension and the swing around job out so now i have 136 ft of stick out. It still leaks down. Least night it leaked down 23°. Today i watched it leak 1° in 10 min. Please help me solve this so i can use my crane. I'm 15k in repairs now
That cylinder has a holding valve on it somewhere, likely on a manifold block on cylinder, that "locks" the oil in the cylinder to prevent drift. Your problem is a failure of that holding valve.
is your machine a tms300 or a tms635be?
Tms300
there is a 1/4" balance line that goes between both holding valve blocks on the cylinders. be sure it is in perfect condition. we had one on a tms300 that had an internal flap (separated liner tube) that caused a pressure imbalance and thusly prevented the holding valve from locking because it held residual pressure in the line and caused boom creep.
If you've rebuilt the cylinder, you probably replaced the holding/check valve. If not, you should. If you've installed a new holding valve and it still drifts down, you likely have an internal leak.
Cylinders both rebuilt twice new valves am gonna change lines between valves and see what happens
Another condition Grove mentions in the service manual causing down drift is an" expanded" or "swelled" cylinder barrel. The manual goes in to detail on trouble shooting hydraulic problems.Do you have a service manual for the TMS300 beamwalker?
No i don't. I've been hunting one for a long time. This crane came from England. My boss has been on three hunt for one also. W have had this crane since 05 and this its the only trouble its given us
I've got a service manual for a tms 300- if you need copies of pages, i can get them for you. The tms 300 use two boom cylinders and two check valves. If you're getting creep, after resealing both and replacing both check valves, you need to find out if the barrels are internally worn or "swelled" as td25c pointed out. The only way to check for that is to remove and internally spec the barrels for excessive wear. You can order new manuals from Grove, but hold onto your wallet, they charge dearly. You actually could use a manual for any of the tms300 series for most of your upper and lower parts and specs, and trouble shooting. Ebay is the best place for them (i just checked and there were two parts manuals and 1 service manual listed- $100-150). The upper structure and the lower outrigger box assemblys are the same as the tms300's built here. The only difference is the european cranes have two man cabs and front outrigger jacks, and some use odd engines (i've seen a few deutz air cooled). You said that the cylinders were rechromed and resealed and then you needed to filter the oil a lot. Were the cylinders really rusty, pitted or chrome flaked off before you rebuilt them the first time? I'm wondering if they were bad enough to have had small pieces of the old chroming caught in the pistons and internally scored the cylinders. If they did, all the new seals in the world won't make it hold. To test the holding valves you should be able to remove the lines to the holding valves, and if oil is coming out after the initial line oil / as it has boom pressure then the oil is coming through the holding valve. If there is no oil coming through the holding valves, then you need to see if the oil is passing around in the barrell. If you had a lot of oil contamination, it can also leave small pieces that get caught in the holding valves, causing them not to work. Let me know if you need some pages copied from any of my manuals.
Today my boss had me get out and go do some welding. I put the boom at its highest point with the hook about 80 feet inn the air. Inside of an hour it dank down to approx 30° good thing i had it pinned over the front. If not it may have turned over
Want to sell? I am looking to buy a used crane TMS 300. The older the better because of the price. Please let me know if you are interested in selling this crane in case you change your mind to sell instead of using it. Thank You