power steering

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We are struggling to isolate the problem with the power steering on our 91 W250 4WD. The pump is engaged to the moter drive, but fluid foams out the top. No power steering evident in the operation of the truck. (hard steering with that heavy engine!!) Mechanic doesn't have pressure guages to check pump output. Has anyone seen this b'fore?

Thanks, Andy

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1999 2500 4wd std cab, Rhino liner, Boss 8' front & custom 7' rear blade for snow removal
1991 W250 4WD 155k mi same as above for plow set up

 

[Archive]

Sounds like it may be the relief valve in the pump has finally let go #ad
. When the valve sticks open the fluid in the reservoir gets churned up pretty good and you have no line pressure.
Sorry to say, but this involves disassembly to repair/replace.

Jason.

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Jason's Lil' Mack - 89 D250LE 2WD 5 Spd 3. 54 Reg Cab. K&N,"tweaked pump", BD Injectors, Banks Pyro/Boost, 3. 5" Exst tail section straight. 23 Psi boost.
E&M Custom seats. Bosch H4, PIAA 80W/80W HdLites. 100W Drv,55W Fogs.
232,500 miles (372,000 Kms) 7700 Hrs.
The Original Turbo Diesel

 

[Archive]

Thanks Lil Dog for your assistance. We had an inkling that the pump was the problem child, so had a replacement ordered. (remans are harder than hen's teeth to find) I'll be sure to let know how we fare.