D15 power steering

My power steering is not working on my D15 diesel. The pump is working but there is very little fluid in the hoses. How do you check the power steering fluid and does it take hydrulic fluid?
 
To check the fluid level you must remove the grille. There is a fill port/breather sticking up on the right side. I don't have my users manual here and the service manual doesn't tell you what oil to use. Bob
 
Use 20w non-detergent engine oil or universal hydraulic fluid 20w. Fill to top of sector gear. Remove grill and filler/breather plug and look into the hole to see sector gear.
 
My reprint of the original A-C manual says, "Ask the owner what fluid is being used." Could be 20wt non detergent motor oil, light hydraulic fluid, or type A automatic trans fluid (original version of Dexron).
 
This is from the I&T AC-ll service manual: Fluid should be 5/8 inch ABOVE sector gear. Type A ATF for Series II D-15, Series III and Series IV D-17. Early D series was SAE 20W, for all temps. Later production, SAE 5W20 below zero temps, SAE 10W30 for above zero. Check with what has been used before. (ATF is likely red)
 

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