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Cat 416 engine will not accelerate unless loader is in

Customer Question
Cat 416 b engine...

Cat 416 b engine will not accelerate unless loader is in motion

Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix. The Construction Equipment Mechanic I'm going to connect you with knows all the tricks and shortcuts.

Please

Mechanic's Assistant: Are you fixing this yourself? What have you tried so far?

The hyd. cooler leaked i replaced the cooler without flushing it out my head was in a dark place that day..i contaminated the hyd, sys. i drained the fluid then changedfilter, ran it a while then changed the filter again. all works fine but the engine lugs and will not accelerate unless the loader bucket is in motion.

Mechanic's Assistant: Anything else you want the Construction Mechanic to know before I connect you?

At startup the engine is free and idle fine no lug down till accelerator is pressed

Submitted: 1 year ago.Category: Construction and Road Equipment
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Answered in 22 minutes by:
11/15/2020
Mechanic: Curtis B., Technician replied 1 year ago
Curtis B.
Curtis B., Technician
Category: Construction and Road Equipment
Satisfied Customers: 43,601
Experience: Technican turned service manager with multiple lines of equipment and rental units.
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Hello! Let's see if we can work together and come to a satisfactory conclusion!

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Mechanic: Curtis B., Technician replied 1 year ago

You have a hydraulic valve loading up the engine, which is relieved when you work a function. Check the relief valve and any related flow control valves. Debris has likely stuck the valve.

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Customer reply replied 1 year ago
Have mechanized all mylife but not hydraulic any recommendations which valve I disassembled pump with parts book open. All reassembly went well feel comfortable with that. Found bucket curl had no o rings installed new and bucket curl good Just will not accelerate unless bucket actuated
Mechanic: Curtis B., Technician replied 1 year ago

look on the loader control valve for the relief valve. And find the flow control off the pump, where the line splits off for the steering and check it.

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Customer reply replied 1 year ago
I will try that
Mechanic: Curtis B., Technician replied 1 year ago

OK>

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Curtis B.
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