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Cat 257B MTL bucket dropping

J

JTWAT

Well-Known Member
Joined
Mar 14, 2012
Messages
177
Location
Central FLA
I am beginning to have a problem with my 2004 Cat 257B MTL.
It has happened twice in the last two days.
When I load the bucket and return the control lever back to the neutral position, the bucket begins to dump the material. At the same time, I can hear a squealing noise.
I can raise the bucket up but it will drop as soon as I move control to neutral.
After playing with the control a bit, it will start to work again.
Anyone have any idea where I would start to look for the problem?
 
7

74inchShovel

Well-Known Member
Joined
Jan 19, 2008
Messages
164
Location
Washington
If it's dropping, then you shut it off does it continue to drop? If so l would hard at cylinder packing. Does raising the lap bar with the engine running stop it from dropping?
 
J

JTWAT

Well-Known Member
Joined
Mar 14, 2012
Messages
177
Location
Central FLA
Has not happened again since first post. Don't think it would be packing's. It drops too fast. It does have a slow drop when shut down. So packing's may be in the future.
 
M

Mark250

Senior Member
Joined
Aug 30, 2015
Messages
1,243
Location
victoria,Australia
Occupation
heavy equipment technician
hi,do you mean that the bucket tilts forward and dumps the load or that the load frame drops down
if you had a squealing noise while the load drops it could indicate a circuit relief valve has opened
a leaking lift cylinder seal would not cause the load frame to drop, possible causes of the load frame dropping are
circuit relief valve
emergency lower control valve partly open
incorrectly adjusted or faulty pilot control valve (with engine running)
Damaged or sticking valve spool
Mark
A serial number always helps
 
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