My 1982 300TD had a saggy rear since I bought it. Reading
this post led me to believe it's a fault pump. Before I spent ~$1000 on a new pump I thought I'd go about trying to fix my existing pump.
I used the SLS rebuild kit from the place in AZ and replaced all the gaskets I could find. One medium, thick gasket remained (any ideas where that's supposed to go?)
While the pump was off I drained the reservoir tank and refilled it with ISO 46 hydraulic fluid.
I reattached the pump and started the car. The rear didn't raise and I opened the reservoir and didn't see any fluid pumping.
Any ideas? I have a new SLS filter that I was going to put on once I verified the pump was pumping. Maybe it's clogged? I'll replace it in the morning and report back.