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  1. J

    Gradall 534C-6 Fuel Starting Issue

    Welp, turns out there was a gunky in-line filter between the tank and the main fuel filters. Aftermarket modification, evidently. We spliced it back together, and pressurized the system. A couple squirts of ether and got’er going. Runs fine. No revs like its getting air leak.
  2. J

    Gradall 534C-6 Fuel Starting Issue

    We knew the manual lever wasn’t pumping, but wasn’t sure why. We pressurized the system with an air tank to get it to push fuel through the filters. I edited my post above that explains why we later found out it wasn’t pumping.
  3. J

    Gradall 534C-6 Fuel Starting Issue

    Delmer, sorry, the lift pump was not working. No pressure at the connection to the filter adapter. After removing the pump, it was immediately noticeable that the internal lever that actuated the diaphragm had come loose from the shaft. I Put a new pump on. Got pressure now at the connection...
  4. J

    Gradall 534C-6 Fuel Starting Issue

    So, having some hiccups with the lift again. This time fuel related (I think). Within the last 6 mos, I noticed while triggering the boom function at idle, the lift would die. Thought that was odd. Never done that before. I’d start it back up. Going forward, I just applied more gas. Well, just...
  5. J

    Gradall 534C-6 Main Pump Squirting?

    Got'er all put back together and functional. The Permco pump I got was the exact displacement as the factory, so if anyone stumbles across this thread in 10 years, you've got an exact replacement.
  6. J

    Gradall 534C-6 Main Pump Squirting?

    Delmer, The oil side isn't pressurized. Yes, the seal was gone out of the accessory drive bearing (pump side) as I pulled off the gear pump. Since 1) the pump seal has no pressure behind it, and 2) the lift only leaked out the top hole when under pressure hydraulic pressure, my neighbor insisted...
  7. J

    Gradall 534C-6 Main Pump Squirting?

    Okay, so hydraulic shop hasn't gotten back with me, but I've since found a supplier for a replacement pump. HOWEVER, turns out my pump was a special size by Gradall. Evidently, companies do that to keep the OEM parts business going as opposed to putting a standard sized pump. My question at...
  8. J

    Gradall 534C-6 Main Pump Squirting?

    Well, not looking good. After a lengthy web chat with a very helpful Bosch Rexroth CSR, looks like I may have two options: 1) Have the shaft seal replaced by hydraulic shop (item 11 in diagram above) if there's no other internal problems and seal can be cross-referenced. 2) Or two, by a...
  9. J

    Gradall 534C-6 Main Pump Squirting?

    So, turns out the headache of this things was obtaining the right sized wrenches and the annoyance of having to take off other hydraulic lines, even the oil dipstick. As I pulled the pump off (top pics), a seal (bottom left pic) from the accessory drive (bottom right) was hanging on the pump...
  10. J

    Gradall 534C-6 Main Pump Squirting?

    Bummed a 2” wrench and got the lower, larger hose off easily. Lightning started striking around me and daylight was waning, so I got out from under the lightning rod I was working on. To be continued....
  11. J

    Gradall 534C-6 Main Pump Squirting?

    Update: no pics, but I’ve got the hydraulic tank drained and started unhooking other hydraulic lines to get better working room for ratchet and breaker bar on the bottom hydraulic line. Turns out my 24” breaker bar is too much for the 12pt, 2” crowfoot for the bottom hose of the pump. The...
  12. J

    Gradall 534C-6 Main Pump Squirting?

    Soooo, apart from the whiskey, how does this thing come off? I assume the headache you're referencing is getting the seal off the shaft? a pry bar all around?
  13. J

    Gradall 534C-6 Main Pump Squirting?

    That's really good info. I'll have to check engine oil to see if hydraulic oil has mixed. What do I look for? It does NOT appear to be squirting from between the pump sections, only at the top mounting hole. What's that mean as I look down over the motor? Totally unrelated, a hydraulic shop...
  14. J

    Gradall 534C-6 Main Pump Squirting?

    Thanks for the responses. I had a busy weekend and wasn't able to tend to the lift. I'm gonna pull the pump next weekend, and I'll know more at that time. I've been referred to a hydraulics repair company locally, so I'm guessing they can figure it out if it not immediately noticeable.
  15. J

    Gradall 534C-6 Main Pump Squirting?

    So, I noticed a bunch of hydraulic fluid dripping below my fork lift. After a short inspection, I noticed it was leaking from the main pump area. I lifting the hatch over the motor and continued use. The lift functions fully, but when I use the lift features (boom, tilt, steering), it squirts...
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