2004 Caterpillar 216B No Auxiliary Hydraulic Flow

Billy Bob Deluxe · Dec 7, 2022

I recently bought an angle blade, that I saw working prior to purchasing, but cannot get any auxiliary hydraulic flow on my 2004 Cat 216B, 0216BERLL00474. I purchased the OMM and tried the sequence suggested in there and also tried the Hydraulic Lockout switch as suggested in another similar thread.
It’s darn near 30 below C and I would like to try everything I can before lifting the cab and blind troubleshooting.
Any suggestions for where to start?

Mobiltech · Dec 7, 2022

So when you roll the thumbwheel on the right joystick can you hear any change in the engine speed?
There will be a fuse for auxiliary hyd ecm try that first.

Nige · Dec 7, 2022

Billy Bob Deluxe said:
Cat 216B, RLL00474

Do you have an electrical schematic for it.?

Billy Bob Deluxe · Dec 7, 2022

Mobiltech said:
So when you roll the thumbwheel on the right joystick can you hear any change in the engine speed?
There will be a fuse for auxiliary hyd ecm try that first.

My unit is older. It has one yellow button on the left joystick and 2 on the right.

Billy Bob Deluxe · Dec 7, 2022

Nige said:
Do you have an electrical schematic for it.?

Yes. You sent me one for an issue I had with the seat safety switch (which I was able to fix using the schematic)! Thanks again.

Billy Bob Deluxe · Dec 8, 2022

Mobiltech said:
There will be a fuse for auxiliary hyd ecm.

Replacing a fuse is an easy fix, I will check them. However, a popped fuse may indicate an underlying problem somewhere else.
What could pop one of these fuses under normal operation?

Mobiltech · Dec 8, 2022

Wire rubbed through or ecm failing.

Nige · Dec 9, 2022

Mobiltech said:
Wire rubbed through or ecm failing.

Speaking of ECMs have you had a look at them recently to see if there is an accumulation of dirt/mud around them.? It’s a common issue and plays havoc with both the ECM and the wiring.

Billy Bob Deluxe · Dec 9, 2022

Nige said:
Speaking of ECMs have you had a look at them recently to see if there is an accumulation of dirt/mud around them.? It’s a common issue and plays havoc with both the ECM and the wiring.

I will have a look thanks.
I understand that replacing these can be very costly.

Billy Bob Deluxe · Dec 9, 2022

Billy Bob Deluxe said:
My unit is older. It has one yellow button on the left joystick and 2 on the right.

My interpretation of the starting sequence for the auxiliary hydraulics is as follows:
Press and hold either yellow button on the right joystick
Press and hold the left button
Release the right button within 1 second
Release the left button
Now I should have hydraulics.
I do not. There is no discernible change in rpm due to load.
I am unclear on the next step in the sequence however, where it says that by pressing either right or left buttons now will cancel/turn off the auxiliary hydraulic flow.
If I did have flow, how would I control it without using the right 2 buttons, which would turn off the flow??
It’s supposed to only be -8 tomorrow so I plan on getting greasy and irate

Billy Bob Deluxe · Dec 10, 2022

Mobiltech said:
So when you roll the thumbwheel on the right joystick can you hear any change in the engine speed?
There will be a fuse for auxiliary hyd ecm try that first.

All fuses intact. All contacts cleaned, dielectric grease and replaced. No change.

Nige · Dec 10, 2022

Have you back-probed the wiring harness connectors underneath both joysticks to check the continuity from the push button switches when they are pressed.?

Billy Bob Deluxe · Dec 11, 2022

Nige said:
Have you back-probed the wiring harness connectors underneath both joysticks to check the continuity from the push button switches when they are pressed.?
View attachment 274672 View attachment 274670

No I have not. Thank you for the schematics

Nige · Dec 11, 2022

I only snipped them from the same electrical schematic that apparently according to your post #5 I sent to you a long time ago.

Billy Bob Deluxe · Dec 11, 2022

Troubleshooting this will require warmer weather and days of down time.
The attached is the left side ECM I presume. I believe this is part of the operator interlock, WH-common, and BU-parking brake lamp. The conductors are still attached.
I did not test the joystick aux hydr buttons.

2004 Caterpillar 216B No Auxiliary Hydraulic Flow

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