D7E Hydraulic line question

Apparently the only document that tells you the hydraulic pressures for the later tractors is the Hydraulic Controls Service Manual for the 172 & 173 hydraulic controls for the D7E which I don't have. Closest I have is for the 193 unit for the D9G which has a maximun operating pressure of 2450 +/- 25 psi . I would think the D7E would be similar or less.

No reason you can't change to hose if you prefer.

Thanks old magnet. I didn't think they were that high but I've never seen any literature to back me up so you may very well be right. Just means there's some higher numbers to look at for the cost of the hose.lol..

Still not certain on which controll I have, there's a tag rivited on the top of the tank just ahead of the filter If I remember corectly. Numbers are hard to make out though. They apear to be more of a serial number rather then model number.

Thanks

Ryan

hello poor farmer/logger ,the serial number would be good ,i have spec sheets for some pump units ,most i looked though have the relief valve set to about 1500 psi .
one reason the steel line maybe cracking is there not bolted down ,loose clamps causing flexing on the pipe ends,the same problem will cause wearing on the rubber hoses as well ,bruce oz

Hi Team,
My OMI for the 173--formerly No 46 H/C-- as fitted to D8, D7, &D6 shows for the following S/No's that the max system pressure relief valve is set to 1,000 PSI.
1W,25C,2W,3W,46C,&48C This is a front mounted unit so as you can see a S/No is vital to getting the correct Data. At The Dealer I fitted both front and fender mounted 173's to New Equipment back in the day.
Cheers,
Eddie B.

The D7E can be a 48C, 24G, 25G, 65G or 67G and a one, two, or three valve system. What is your configuration? Blade only, w/ripper, w/tilt?

The 48C is the old #46 single valve low pressure system.
The 65G & 24G are the later single valve systems (different pump flows)
The 25G is a double valve system
The 67G is a double valve with single valve remote.

It's the later G series systems that require the Service Manual (different for each) to get the specs.

These are all rotary vane pumps so I doubt the pressure would be to high.....1500 psi sounds about right.

173 hyd units
The 48C is the old #46 single valve low pressure system.
1175-1225 psi ,110gpm@1200 rpm.
.
The 65G & 24G are the later single valve systems (different pump flows)
24G-1475-1525psi,65G-1975-2025psi
.
The 25G is a double valve system
1475-1525psi,
.
The 67G is a double
external control valve 1175-1225 psi,pump 1975-2025 psi.
bruce oz

Thanks Bruce,
I'm curious about where you found the pressures. Do you have the actual service manuals for these controls or some other source?

PFL,
The main flows involved are either 54 gpm or 100gpm for the #48.

Okay, serial number of the crawler is 48A 5134. Don't have the number handy off the tank so I'll run out and try to make it out this afternoon.

It's configured with a blade and ripper valve. No ripper on curently though so it's been blocked off I believe.

I think it's just metal fatigue combined with vibration. The lines are clamped to the cylenders but there's still bound to be some vibration going to them. After 45 years I guess it's to be expected.

Thanks for the numbers everyone.

Ryan

Okay, just got back in again. Number that is on the hyd tank is 34H 2574. There's aslo what I presume is a part number stamped into it. That is 6J 1240-1

Ryan