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I believe the army specified 30wt motor oil in the lubrication order. Many, myself included, drain and refill with hydraulic oil. It is not good to mix types as additive packages can have ugly incompatiblities.

Good to hear you got the problem identified. Ouch that valve is pricy!

Did yours fail? Just curious because my flu has an issue where it will constantly raise the loader . I assume it is electrical because I was able to stop it by disconnecting the wires to the loader valve, but I do need to dig into them some day.

I don’t have guidance on the replacement pump. I do have a spare from a FLU I parted out if you need one. If my pump ever fails, I would consider a larger pump to make the loader respond a little faster.

I have 380/75R20 XMCL tires on mine on drum brake rims. They hit the hydraulic lines on the front Left while steering with suspension compression. I think disc brake rims might be better, but I am not sure. Others have put 14.5R20 on disc rims with no complaints. 14.5R20 were an optional tire...

Yes, a backhoe off a FLU419. I had parted out a complete truck a couple years ago and many on this forum have been beneficiary’s of the parts. PM me a photo showing the cylinder you need and I will see the condition it is.

The FLU parts book says NPN-241 which is not valid in the CASE system. Looks like the 580e gland is G107524, which may sub to 1543019c1 for $460 from Case.

I have a spare backhoe I have been parting out, including cylinders. I can try to look at the parts catalog to see if they are the same.

In my case, the contacts inside the push-pull switches were dirty. I removed the switches, pulled the backs off and cleaned them, then put them back together.

I had a time that my tool switch was dirty and did not work. I switched the wires for the loader valve behind the cab with the hydraulic tool valve. Left a wrench wedged against the loader switch and was able to verify tool operation. You could also have “soldier B” hold the switch. Since you...

The 419’s use dual calipers on the front axles. Given your (presumably) lighter weight, you could drop one caliper from each side and hook to your existing master cylinder. The 419 is air assist hydraulic, not air brakes.

Is it more likely that one switch is in the back hydraulic circuit and one is in the front hydraulic circuit? It has been a while since I looked at it, but I think both circuits run through the cooler.

To answer directly the question you asked, I would not be scared by up to 3000hours and 20K miles. These are commonly seen on the MB4/94’s, the father of the FLU419. Because of the way the military operates, these trucks(tractors) may have been rebuilt thoughout their lives and had speedometers...

No. I don’t trust the miles or hours period. I go by condition. They are old enough that one with 5 hours may be rusty compared to one with 5000 hours that has been maintained and lubricated.

Mine have all been very corroded, so I understand replacing them. I found some surplus Haltec TR618A’s on an auction site for cheap.

You are right. I did know that, but had brain flatulence.

I checked mine today. Indeed what I think is the vent from PS runs into the cap of the timing cover. I found my hose on the PS was actually rotted and disconnected. I traced the line in red and circled the connector on the PS reservoir that I assume it connected to. I left my hood off as a...

You can get one of my power adapter brackets. Latest version has a 6mm hole for a micro switch for the low air pressure alarm.

Did you replace the clutch master cylinder? The clutch master cylinder can leak internally and not function with no outward failure mode. The slave cylinder will fail with visible leaking. DOT 5 is correct to use.

Time to review your operator manual again. That is the cord to allow the blackout light to be mounted on the loader frame. Most blackout lights are mounted to the left front of the cab but when blackout lights are to be used they’re supposed to be relocated to the loader frame and that cord used...