Gregory A White
Active Member
Nige, I have a guy coming this week to check and test the pump. I don't have the tools.
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2004 Cat 257b Drive problem
- Thread starter Gregory A White
- Start date
Nige
Senior Member
Greg, there are two different styles of motor depending on when the machine was built. The illustration that Dmitry posted and I repeat below was for a "Type 2" motor. Your Serial Number is a very early machine and, by Serial Number should have "Type 1" motors. The Type 1 motor parts breakdown does not show anything for the piston brake seals. The Type 2 motor was installed from the factory only on SLK-prefix machines with S/N above 6250. See attached.
The only thing I can suggest is to look for a data plate on your motor with the Cat Part Number on it.
222-5662 is what it should have by machine Serial Number. The later Part Number is 280-7862.
The only other thing I can think of off-hand is that these motors were built for Cat by Rexroth. It may be that if Rexroth model details can be found that parts can be obtained outside the Cat parts system
dmitry_bulldozerman
Well-Known Member
I think the correct hydraulic motor number is 222-5662, since the machine was manufactured on 08/01/2004. And the 218-6631 group is relevant for 2004. Separately, the brake piston seal numbers are not indicated in SIS, but there is a number for a set of seals for repairing the hydraulic motor, 268-1933 KIT-SEAL (INCLUDES SEALS & GASKET).
Mobiltech
Senior Member
I’m still wondering how you did a case drain test for an hour to get 9 gallons.
This motor needs to be stalled a full drive pressure to do the test. You also need to stall it in multiple positions of travel to do it correctly. This motor makes one revolution for each revolution of the sprocket.
This motor needs to be stalled a full drive pressure to do the test. You also need to stall it in multiple positions of travel to do it correctly. This motor makes one revolution for each revolution of the sprocket.
92U 3406
Senior Member
You make a good point. I just assumed an amount was measured for a minute and then multiplied by 60 to get that number.
ThreeCW
Well-Known Member
For clarity, is the motor number that you refer to in Post #35 noted above from the actual motor plate?
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Nige
Senior Member
If it is then the news might be a little more promising.........
The attached is the parts breakdown.
Unfortunately I can't see a detailed breakdown anywhere of the 289-6343 Seal Kit.
Gregory A White
Active Member
I cannot locate a part number anywhere on my motor. The diagram Nige sent me is very similar to my motor and the seal in my motor is not an “O” ring. I found a number stamped in the edge of the mounting plate C779956. 10 03 stamped about 2” away. I can’t find that number anywhere on the internet.
PS- Thank all of you for sticking with me in this very long thread.
Gregory A White
Active Member
Forgot. REXROTH is stamped on it.
Gregory A White
Active Member
Well Mobiltech, I blew that test. It drained the reservoir tank.. The brake piston was kind of in a tiny bit of bind when I took it out. I put a light air pressure in and it came loose then I used a magnet to pull it out. The seal isn’t broken but definitely needs to be replaced.
Nige
Senior Member
So where exactly did the 280-7862 Part Number come from.?
You were the one who originally mentioned it.
Gregory A White
Active Member
280-7862 replaced the 222-5662. My motor is no longer available according to Catparts.com
Gregory A White
Active Member
Attachments
Gregory A White
Active Member
I haven’t gotten to that yet. One of the rollers was stuck. I pulled the rest out with a magnet. Finally got the stuck one out. I believe the stuck roller along with the bad seal on the brake piston may well be my problem cause the pulsating of the track. What is your opinion?
Nige
Senior Member
While everything in that statement is technically correct that does not mean that the motor on your machine is a 280-7862.
In fact based on the information that I mentioned earlier it is more likely to be 222-5662, a motor for which only a limited number of repair parts are available. Unfortunately that does not include the brake piston seal. I would hazard a guess that the only way you might get parts is via a Rexroth dealer.
Gregory A White
Active Member
You are correct Nige. I tried to order the motor #222-5662 from Cat. It has been replaced by part # 280-7862 thru Caterpillar.
Mobiltech, That stuck piston seal/square "o"ring was in pieces. No scarring on any of the 8 pistons or piston wall. I am now trying to locate the piston "O" rings but, even Bosch Rexroth is having problems locating. They can't even give me the part number or size of the piston "o" rings. I am going to Grainger Supply to see if I can find them there. I phoned Caterpillar to no avail. I may have to buy a motor because of this.
Gregory A White
Active Member
dmitry_bulldozerman
Well-Known Member
There is no need to buy an engine because of two piston seals. I think these seals can be found by selection. And theoretically, the 268-1933 KIT-SEAL (INCLUDES SEALS & GASKET) should contain all the sealing rings and gaskets, including the piston.
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