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Cat 416 resolver question

J

jlittle2212

Well-Known Member
Joined
Dec 8, 2013
Messages
219
Location
The Mountains
Was having loader issues. Would only raise when other function was used. Replaced bad seals in resolvers behind right rear tire. Now, loader will lift, but slow and only goes about halfway. Makes no difference if you use another function. Would the lower 2 resolvers cause this? I double checked, All balls in place. Someone help please.
 
M

Mark250

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Joined
Aug 30, 2015
Messages
1,243
Location
victoria,Australia
Occupation
heavy equipment technician
there are at least 25 versions of the 416 plus serial number brakes
WHAT IS YOUR SERIAL NUMBER !!!!!!!!!!!!!!!!
Mark
 
D

Dickjr.

Senior Member
Joined
Mar 24, 2011
Messages
1,484
Location
Kentucky
Mark250 as you know my 416C s/n 5yn6433 is doing the same exact thing. We replaced all the orings on the secondary resolver , I think I need to remove the plunger cup with the 2 , 10 mm bolts and replace the primary resolver in the boom / swing function. My question is , if I remove the plunger cup , is it as simple as unscrew the resolver with a 6mm alen wrench , put the o ring on and reassemble or are there other parts to contend with? I've been fighting this for over a year , had it to a shop , still same problem.
 
M

Mark250

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Location
victoria,Australia
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heavy equipment technician
Dickjr, probably best not to hijack this post and return to your own post

from your own post I was under the impression that you changed all the seals on the primary and secondary resolvers
once you remove the cover for access the primary resolver comes out as one piece there are 3 'o' rings and 4 back up rings.
did you follow the test procedure I posted as a pdf in your other post
mark
 
D

Dickjr.

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Mar 24, 2011
Messages
1,484
Location
Kentucky
I wasn't by any means trying to high jack his thread , just that the issues with both machines are so similar. I wonder how close his serial number is to mine or what model he has. Its weird that a tiny o ring can stop these things from performing like they should. I wish I could get my hands on a bad valve and disassemble parts of it to see what's in there.
 
B

BlazinSS934

Well-Known Member
Joined
Feb 5, 2012
Messages
125
Location
Long Island, NY
I'm not very proficient in hydraulics can you explain how a resolver network works on these machines? My 416it has been acting funny lately, the other day I couldn't pick up the back of the machine with the boom. I had to rev the machine al the way up.


Sent from my iPhone using Tapatalk
 
C

chris allen

Senior Member
Joined
Feb 11, 2014
Messages
372
Location
georgia
Occupation
Feild tech
im familar with the cat 416s , worked for cat for yrs an 9 times outta 10 if ur having issues with the controls on the machine with the front or rear controls, it allways seemed to be the resolvers in both the primary an secondarys, if theres orings blown next to a control itll make the function next to it act up, for not more than the orings cost just go ahead an remove all of the an replacem all, just becareful an watch for the balls not to fall out, if they do just grease all the resolvers up an put the lil balls back on the end an reinstall the resolver back into valve body, the grease will help hold the ball, ITS A GOOD IDEA TO USE THE CORRECT ALLEN WRENCH ON A SOCKET AN USE A HAMMER AN TAP THE ALLEN SOCKET UP INTO THE RESOLVER ASSEMBLY, they are bad about sticking an easy to strip out the allen head screws. very easy task to do just pay attention while doing it. cat uses the resolver assemblies in several differ kinds of cat tractors an generaly when a tractor gets some age on it they tend to start to fail. they'll be missing from resolver or blown out, don't worry bout missing orings, ur filter will catchem.
 
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Dickjr.

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Joined
Mar 24, 2011
Messages
1,484
Location
Kentucky
chris allen , I was hoping to get the op's s/n to see if its close to mine. We actually changed all the orings on my machine , primary and secondary and I still have the problem. My machine has slow boom up and the lift is almost non existent. I have noticed my hydraulic oil temp rises while operating and the boom swing control is giving me some feedback as far as a vibration. The pump is strong , you can actuate another function and here the pump ramp up and the response is good. Wondering if the whole valve needs to be removed and rebuilt. My mechanic says its got to be a signal line problem. When I get a minute I plan to do as Mark250 says and run some pressure tests.
 
C

chris allen

Senior Member
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Feb 11, 2014
Messages
372
Location
georgia
Occupation
Feild tech
well the control valves really only consist of the spools for each function an primaray an secondary an the lil balls, also few relief valves an loc check valves, go the the hyd pump there under the floor that mounts to the trains, there on the side of the pump is the compusateing valve, it reads signal pressure from each function an up strokes the hyd pump when oil is needed. hook a gauge there into test fitting there at comp. valve an start working the controls an watching ur pressure reading.
 
D

Dickjr.

Senior Member
Joined
Mar 24, 2011
Messages
1,484
Location
Kentucky
Thanks for this advice , I do have one more question ,what type coupler and size connects to the pump? I know Mark250 has given me the procedure , I just need the gauge assembly so I can start taking pressure readings.
 
C

chris allen

Senior Member
Joined
Feb 11, 2014
Messages
372
Location
georgia
Occupation
Feild tech
look under there you will see tha male fitting, its a quick disconnect ,,, go to local hyd store that sells stuff they should be able to help ya out, heck take a pic an show ur guy in the store an get ya gauge an few feet of hose. be cheaper than going to cat an getting the stuff to test with,,,, I know what they cost a cat I use to work there.
 
J

Jason 446b cat

Member
Joined
Jul 24, 2018
Messages
8
Location
Tishomingo OK
chris allen said:
im familar with the cat 416s , worked for cat for yrs an 9 times outta 10 if ur having issues with the controls on the machine with the front or rear controls, it allways seemed to be the resolvers in both the primary an secondarys, if theres orings blown next to a control itll make the function next to it act up, for not more than the orings cost just go ahead an remove all of the an replacem all, just becareful an watch for the balls not to fall out, if they do just grease all the resolvers up an put the lil balls back on the end an reinstall the resolver back into valve body, the grease will help hold the ball, ITS A GOOD IDEA TO USE THE CORRECT ALLEN WRENCH ON A SOCKET AN USE A HAMMER AN TAP THE ALLEN SOCKET UP INTO THE RESOLVER ASSEMBLY, they are bad about sticking an easy to strip out the allen head screws. very easy task to do just pay attention while doing it. cat uses the resolver assemblies in several differ kinds of cat tractors an generaly when a tractor gets some age on it they tend to start to fail. they'll be missing from resolver or blown out, don't worry bout missing orings, ur filter will catchem.
Click to expand...
 
J

Jason 446b cat

Member
Joined
Jul 24, 2018
Messages
8
Location
Tishomingo OK
On my cat 446b the swing is slow and weak left or right. all else is good. I want to replace resover seals what do you recommend and where are they located?
 
G

gwhammy

Senior Member
Joined
Nov 20, 2013
Messages
606
Location
missouri
Had the same problems you are having. If you can use a different valve and make the slow one speed up it's the resolver valves.
I've replaced all the resolver valves on my 436b. Did the main valve body first, just took it off and had it completely resealed and all new resolver valves put in.
Wasn't long till a resolver valve went bad in the valve body for the front bucket and arms. Just put them all in and solved all the problems.
 
J

Jason 446b cat

Member
Joined
Jul 24, 2018
Messages
8
Location
Tishomingo OK
gwhammy said:
Had the same problems you are having. If you can use a different valve and make the slow one speed up it's the resolver valves.
I've replaced all the resolver valves on my 436b. Did the main valve body first, just took it off and had it completely resealed and all new resolver valves put in.
Wasn't long till a resolver valve went bad in the valve body for the front bucket and arms. Just put them all in and solved all the problems.
Click to expand...
wh
gwhammy said:
Had the same problems you are having. If you can use a different valve and make the slow one speed up it's the resolver valves.
I've replaced all the resolver valves on my 436b. Did the main valve body first, just took it off and had it completely resealed and all new resolver valves put in.
Wasn't long till a resolver valve went bad in the valve body for the front bucket and arms. Just put them all in and solved all the problems.
Click to expand...
 
G

gwhammy

Senior Member
Joined
Nov 20, 2013
Messages
606
Location
missouri
They are all in the valve bodies, I can't tell you exactly where. Just a small pencil shaped valve. Trace the hoses from the swing cylinders to the valve section.
 
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