Hydraulic system

[Givinup]

Is the hydraulic system on the m1088a1 an open or closed system.

I need to remove the spare tie hydraulic jack and am wondering if I need to be prepared for a few gallons to leak out, or the entire system. Likewise, I need to learn how to refill it and close it back up.

I can't seem to find the hydraulic reservoir/fill. Unless it's taking off the hydraulic to air unit cover.

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[Suprman]

Pump behind cab has res in it.

 

[Scott z]

I have the same questions as the op. I don't see a reservoir either. (2003 m1078-a1). I've looked behind the cab where the original manual shows it should be and I don't see anything on either side.

 

[NDT]

Its in the middle, under the decontamination bracket. Has a knurled screw for the filler.

 

[Givinup]

Pump behind cab has res in it.

I've seen a picture of the tip removed from the pump. Is this how you refill?

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[Awesomeness]

No, like Suprman said, it has a little knurled knob on the top of it that is the fill port / dipstick.

 

[Givinup]

No, like Suprman said, it has a little knurled knob on the top of it that is the fill port / dipstick.

Will check it out today. Missed the knurled knob post before my response.

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[Scott z]

Thanks all. Found mine. Knurled knob is much smaller than expected.

 

[Givinup]

View attachment 710921View attachment 710922 Thanks all. Found mine. Knurled knob is much smaller than expected.

Awesome thank you for the picture. I would not have been looking for a nut that looked like that. Very helpful.

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[tennmogger]

Its a closed system, based on what I think you are asking. If the valve for the subsystem you are dismantling, like the tire lift, is closed, no oil will leak out except that in the hoses and cylinder of that subsystem. Plugging is still a good idea so a misplaced valve position does not dump oil accidentally.

 

[Givinup]

Its a closed system, based on what I think you are asking. If the valve for the subsystem you are dismantling, like the tire lift, is closed, no oil will leak out except that in the hoses and cylinder of that subsystem. Plugging is still a good idea so a misplaced valve position does not dump oil accidentally.

Great info, thank you. That's the plan, but I'll plug anyways.

Checked the hydraulic reservoir and it's way below the refill line. The hydraulic jack is the only think leaking to my knowledge, but I'll refill and check after plugging the jack. Appreciate the suggestions.



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[Givinup]

Checked out my hydraulic pump reservoir yesterday, turns out it's really low. Upon removing the spare tire jack (that was leaking) what's the beat way to bleed the hydraulic system of air (on the hydraulic side)?

Can I fill up the reservoir with the knurled nut off, or should I fill in stages and run the cab jack to circulate the new hydro fluid in, stop and repeat?

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[Awesomeness]

I think it's self bleeding. Did you check the manual, in sections related to something like changing the cab hydraulic cylinder or the pump, to see what it says? You'll find that the manuals are amazingly detailed so that even the greenest of mechanics can perform the work (e.g. it will tell you to take a bolt out, remove a part, and then to store the bolt back in the hole [until you get to the section to replace the part]).

 

[Givinup]

I think it's self bleeding. Did you check the manual, in sections related to something like changing the cab hydraulic cylinder or the pump, to see what it says? You'll find that the manuals are amazingly detailed so that even the greenest of mechanics can perform the work (e.g. it will tell you to take a bolt out, remove a part, and then to store the bolt back in the hole [until you get to the section to replace the part]).

I haven't yet. The manual I have isn't searchable, and the only medium I have to view it is on my phone (no access from work or home), so it makes viewing the manual somewhat cumbersome. I can certainly use it, it just takes longer usually for quick answers.

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[porkysplace]

I haven't yet. The manual I have isn't searchable, and the only medium I have to view it is on my phone (no access from work or home), so it makes viewing the manual somewhat cumbersome. I can certainly use it, it just takes longer usually for quick answers.

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Well you could always stop by your local library are print that section of the TM off.