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I have a bobcat 873 F Series. I've replaced a hydrualic hose…

Customer Question
I have a bobcat...

I have a bobcat 873 F Series. I've replaced a hydrualic hose and repacked several cylinders. I've re-filled the hydrualics with AW46. I've got s severe shuderring in the tilt and lift.

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

Ok

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

Just made sure there are no leaks. Looked at pedal linkage. May need bushibgs but it was only mild before I did the cylinder and hose repair. I'm a good car mechanic and have Bobcat manual but don;t know my way around the 863.

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

I did check the left side drain filter. No issues. Replaced. Could not get to the right one. Did when I replaced filters and topped up fluid per manual. Ok

Submitted: 6 months ago.Category: Construction and Road Equipment
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Answered in 11 minutes by:
7/30/2017
Mechanic: Curtis B., Technician replied 6 months ago
Curtis B.
Curtis B., Technician
Category: Construction and Road Equipment
Satisfied Customers: 29,665
Experience: Technican turned service manager with multiple lines of equipment and rental units.
Verified

Hello! Let's see if we can work together and come to a satisfactory conclusion!

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Mechanic: Curtis B., Technician replied 6 months ago

Check the suction pipe to the hydraulic pump, may be sucking air or has a restriction, which will draw air into system, causing the shuttering.

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Customer reply replied 6 months ago
Curtis -
where is the hydraulic pump? I have the service manual but need some direction.
Customer reply replied 6 months ago
As its not a good print
Mechanic: Curtis B., Technician replied 6 months ago

Hydraulic pump is the small pump on the end of the two drive pumps

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Customer reply replied 6 months ago
Ok. I'll have to pick this up in a few days after i get back in town. Is that ok?
Customer reply replied 6 months ago
Btw - the shudder is on the way down on the lift. Never on way up. Does that help?
Mechanic: Curtis B., Technician replied 6 months ago

That could mean the control valve has problems with the load checks , which have to open when you lower boom. Will not be suction problem!

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Customer reply replied 6 months ago
It had a slight shudder before I replaced hose and re-packed 3 cylinders and changed filters and topped up fluid but not like this.Not running it of course. I can re-diagnose if I need to.
Mechanic: Curtis B., Technician replied 6 months ago

The load checks, may have debris or dirt in them, Look at the small valves with springs, between the two valve sections in your parts book.

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Customer reply replied 6 months ago
I've got an 800 page service manual and Bobcats on line catalogue. When I look at the Hydrualic schematic in the service manual I see multiple references to control valves. Apologise that I don't understand the flow.
Customer reply replied 6 months ago
Wait a sec - found the Hydraulic Control Valve section in my svce manual
Mechanic: Curtis B., Technician replied 6 months ago

You have a single control valve for the bucket and boom, i may have an auxiliary spool too. But this control valve has the check valves , between the sections. They may not be called load checks, just check valves, or recirculating valves.

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Customer reply replied 6 months ago
This section?Load Check Valve
Loosen the load check plugs (Item 1) [A).
Assembly: Always use new O-ring. Tighten the plug to
35-40 ft.-Ibs (47-54 Nm) torque.
Remove the load check plug [8] .
Remove the spring and poppet [C).
Mechanic: Curtis B., Technician replied 6 months ago

That sounds like it, remove them and examine for debris or blown o'rings.

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Customer reply replied 6 months ago
Not to digress - but when I look under the cab I see a couple of disconnected connectors. Been that wait. Have no idea but wanted to share. Full disclosure. Only 1400 hrs on machine. Use sparingly around property.
C1 Load Check Valve/Lift Function
C2 Load Check ValvelTiit Function
Above inschematics on page 2-21
No fluid pressure on them correct?
Mechanic: Curtis B., Technician replied 6 months ago

With engine off, there will be no pressure.

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Customer reply replied 6 months ago
Sorry about typos.Ok. Suggestion. I need to study schematics and understand system better. I have to be away from this for 2 days. Why don;t I study the schematic and then look at the valve. Then if I need to get you on the phone it will be less painful for you. Can we do that at the end of the week?
Mechanic: Curtis B., Technician replied 6 months ago

Sure, I should be close.

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Customer reply replied 6 months ago
Ok. I'll get back to you.
Mechanic: Curtis B., Technician replied 6 months ago

Thanks!

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Category: Construction and Road Equipment
Satisfied Customers: 29,665
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Experience: Technican turned service manager with multiple lines of equipment and rental units.

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