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I have a cat 420e it when you lower loader boom there is no…

I have a cat...

I have a cat 420e it when you lower loader boom there is no response till you hit the float detent then the boom drops

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.

I think it has to do with the ride control circuit

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

Yes im trying to fix myself when i jump the wires on pressure switch ride control works but loader boom down isnt resposive

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

When the loader joystick is past the float detent you have down pressure

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Answered in 10 minutes by:
12/14/2017
Mechanic: Dan, Technician replied 4 years ago
Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 15,097
Experience: 17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.
Verified

Hi ,My name is***** will be glad to help. We can follow up as needed on here, bare with me while I review your information. Im not an employee of the site but I help on here as time allows in between jobs. Response time will vary depending on my work load , etc each day. What is your serial number?

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Customer reply replied 4 years ago
hi my name is gazz serial #catoeckmw02858when i jump the pressure switch ride control works but no loader boom down pressure til joystick passes float detent
Mechanic: Dan, Technician replied 4 years ago

Is it just boom down or all boom and bucket functions?

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Customer reply replied 4 years ago
just boom down
Mechanic: Dan, Technician replied 4 years ago

Thanks for the update. Check the control valve spool for full travel or for sticking or other damage or scoring. If okay check the relief valve cartridge and the resolver network in the control valve. Look for debris or trash in the valve. Let me know. We can follow up as needed.

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Mechanic: Dan, Technician replied 4 years ago

Please take a moment to rate as that is how the site credits my time helping on the site or let me know if you need more help. 5 star and bonuses are always greatly appreciated.

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Customer reply replied 4 years ago
machine had to go back to work we will be getting back to it next week thanks
Mechanic: Dan, Technician replied 4 years ago

Thanks for the update. Pleasure to help

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Mechanic: Dan, Technician replied 4 years ago

Hi, Did you get this resolved? Please take a moment to rate as that is how the site credits my time helping on the site or let me know if you need more help. 5 star and bonuses are always greatly appreciated.

Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 15,097
Experience: 17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.
Verified
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Dan
Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 15,097
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Experience: 17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.

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