Im looking at trading my deer 690c for a 96 2700q with 10000 hours.was wondering how these hoes held together. i no its a smaller machine but i think its speed will make up for its size any thoughts. thanks
You mean a Link Belt? And 10,000 hrs??? Got pics?
yes linkbelt 2700q with 10,000 hrs was wondering if the swing bearing held up, hyd track drive motors, and main pump held up.was this hoe well built or something to stay away from. thanks
One of the Parker Pacific (Link Belt, Case Kenworth dealership) sales reps told me they had some issues with the swing gears on the older ones, I can't remember which model years they were. If you can test it out, stretch the boom all the way out above the ground (clear the way first!!), swing 2 full revolutions and let go of the pilot control, if there is excessive grinding before, during and after as the swing brake comes on, there might be an issue. There should also be a separate switch to turn the swing brake off/on, the 3400 I saw kept blowing the fuses on it. Another test is under full throttle, drive in a straight line and move every function at once to see how the valving holds up, Komatsu's had a micro switches under the foot pedals that always failed when that type of test was done. The swing gear is always something people over look when buying used excavators.
A friend of mine had a 2700Q that had a bad swing bearing. He ran it for about a year and sold it for what he paid for it after he bought it at an auction.
I don't recall any specific swing bearing issues on 2700Q machines but at 10,000 hours it can happen on any excavator. To check the bearing I use a dial indicator. Put the house so the front idlers are in front, stretch the boom all the way out, put the bucket on the ground and push down with the boom until the front of the machine is off the ground. Set up the dial indicator on the carbody with the probe on the outside ring of the swing bearing. Pick up the boom and read the play in the bearing. New bearings usually have 0.030 to 0.040 inch up and down. When they get over 0.060 inch up and down the operator can usually feel it. If you get that much movement I would walk away from the machine. The issue with grinding being felt when the machine was swinging usually was from the swing pinion and ring gear not being greased. If the bearing were bad you would get flakes of metal in the grease after you lubed the bearing. Also the swing brake does not stop the house from swinging. It only sets after all the controls have not moved for more than seven seconds. The cross over reliefs on the swing motor are what stops the house from turning. As far as the straight travel system goes the auxilliary circuit is not tied into it. If this machine has a thumb and you operate it while traveling, the machine will vear off to one side. A better test is to walk the machine for about a 100 feet if possible. Don't use any other control, just the travel. Check the track marks on the ground and see if they show a slight turn to one side or the other. If that is straight do the test in reverse and check for straight again. If it doesn't walk straight then don't buy it. Pumps and swing and travel motors usually didn't give much problem but again, a unit with 10,000 hours can have many problems. As I recall when the pumps went bad they would stay on stroke when you let off a control and start to drag down the engine rpm. If that happens run, don't walk away. Good Luck!
thank for the help . :drinkup
any though on how a newer 35000 lbs hoe will compare to my old 690c deere a 42000 lbs. the reason i was going with the smaller hoe is the 8'6 wide makes it easy to jump on and off my over the back lowboy. my 690 is 8'6 wide. most newer 45000lbs class hoes are to wide for my old lowboy.
Anything newer will compare better to anything older, even if the new is smaller, it'll dig faster than the old. Just like computers back in the 70's, they were massive and slow, now they are small and fast, and really annoying. :Banghead
john c is that brake style common in most excavators? Meaning the swing brake is simply the hydraulics pushing thru a relief when the controls are neutralized during swinging? Reason I ask is over the summer I ran a 350 Cat for a while that developed a horrible screaching while swinging to a stop loading trucks. Mechanic came out and found out that when a welder repaired a hole in the big...he called it the tub (the area that houses the swing gear) (and some bands that I thought he explained as the swing brake) he didn't replace the grease, so it was nearly dry. All we had onsite was tubes so he squeezed almost 5 cases of tubes in it. After filling the screaching stopped. There was never a seven second delay while I was swinging buckets, but the way I understood it that swing brake in there was dry, hence the bloody murder screaching.
I have just over 8K on a 9020B CASE excavator which is the same series of machine as the Link Belt Q series. I have not had a problem with mine, very tight for the hours, but with a 10K machine the way it was maintained has as much to do with how long it will last as anything else.
Makensmoke, The tub the mechanic was talking about is where the swing pinion gear runs against the ring gear to turn the house against the carbody. It is supposed to be filled with grease for the gears to run in. If there wasn't any grease the squalling you heard was the two gears running against each other with no lube. All the excavators I have worked on that were out of Japan only use the swing brake as a parking mechanism. It is a multiple disc mechanism in the bottom of the swing motor. In the old Link-Belt 4300C and CII series machines they used to use the alternator to sense engine rpm. When the alternator went bad it didn't put out enough voltage for the computer and it would allow the swing brake to partially set. A lot of swing brakes burned up because people couldn't understand that the alternator could cause the problem.