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CAT 226 stopped. Will not move and hydraulics do not operate.

Ron Gherman

Member
Joined
May 24, 2020
Messages
8
Location
Soldotna, Alaska
My CAT 226 stopped. Will not move and hydraulics do not operate. It is going up a hill about 20 degree angle. Engine runs fine and electric works on lights, gauges, ect...
I have the manual. It is a 2003 and has worked great since I purchased it. Never had a problem until today. Thoughts?
 

Ron Gherman

Member
Joined
May 24, 2020
Messages
8
Location
Soldotna, Alaska
I was able to drag the unit down the hill to a level spot. Hydraulic fluid was higher than normal. I have drained enough fluid to bring it recommended level. Engine and electrical systems still fine but no Hydraulics still.
 

Cmark

Senior Member
Joined
Jan 2, 2009
Messages
3,176
Location
Australia
No warning lights suggest the interlocks are working. Spinning fan says that the pump drive is OK.

Another thought, when you turn the key on, do all the warning lights come on and then act as expected. ie. park brake light responds to the switch, armrest light comes on when you lift the armrest, etc?
 

Vetech63

Senior Member
Joined
Aug 10, 2016
Messages
6,362
Location
Oklahoma
Possibly the safety lockout system. Could be either mechanical or an electrical issue. Have you checked the fuses in the panel to start off with?
 

Ron Gherman

Member
Joined
May 24, 2020
Messages
8
Location
Soldotna, Alaska
No warning lights suggest the interlocks are working. Spinning fan says that the pump drive is OK.

Another thought, when you turn the key on, do all the warning lights come on and then act as expected. ie. park brake light responds to the switch, armrest light comes on when you lift the armrest, etc?


Yes to all the above.
 

Cmark

Senior Member
Joined
Jan 2, 2009
Messages
3,176
Location
Australia
This is the interlock manifold. Solenoid valves 6, 7 and 8 are for park brake, transmission and implement, respectively. Each coil should have a resistance of 10.5 ohm. If that all checks out, you can apply 12v to the coil to see if the function starts working.
sol.jpg
 
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