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hydrolic problem cat 320 bl 1997

G

gavin26er

Member
Joined
Apr 17, 2013
Messages
6
Location
gander
when i push out the dipper stick and pull in the stick all the way it stalls the engine. i tryed everything i can think ive changed the filters, cut them apart also no cutting. two new presure switches on valves. when using dipper switch there is a hissing noise. also if someone knows where to get a shop manual.

gavin
 
M

mascas

Well-Known Member
Joined
Jan 24, 2008
Messages
54
Location
missouri
Occupation
Mechanic
Did this just start or is there something that led up to the problem? How many hours on pump?
 
G

gavin26er

Member
Joined
Apr 17, 2013
Messages
6
Location
gander
No it just happened. 7500 hrs on pump pressure
Test done on pump in the right ranges. I replaced
3 hoses last fall
 
B

Bob/Ont

Senior Member
Joined
Sep 18, 2012
Messages
1,605
Location
Ontario
Gavin, I wonder if the wire came off of the PRV or the coil is burned out. Sounds like it's not working.
Later Bob
 
A

arie

Member
Joined
Mar 26, 2013
Messages
5
Location
indonesia
Gavin, have you measure resistance of PRV? should be aroung 13 Ohm. If below 11, change it.
 
C

cjplanthire

Well-Known Member
Joined
Aug 1, 2011
Messages
121
Location
Eire
Occupation
Plant contractor
Have you checked The flow and pressure settings And ajusted them back To The factory setting

It could be a kinked pipe if Your lucky

But My experience of these age And model cats is that you have either a stucking valve or you need a new pump or a pump rebuild
 
M

mascas

Well-Known Member
Joined
Jan 24, 2008
Messages
54
Location
missouri
Occupation
Mechanic
Sounds like when you are double functioning the machine the pump is killing the engine. The pump should have HP settings on it to stop this from happening. I'm not sure on this model cat, but the Uchita Rexroth pump may be tied into the ECM on the engine. I have fought other Cat machines similar to this and found out I had to get CAT Tech out with a computer to recalibrate the pump to the ECM. However this was when a new pump was installed. I have also seen a 330 do this when it had a stuck spool in the control. Once we got a new spool in it the old girl worked great.
 
Pauly17

Pauly17

Well-Known Member
Joined
Apr 11, 2013
Messages
45
Location
Jeffersonville
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