Hyd Pump (Joyang F23)

   / Hyd Pump (Joyang F23) #1  

dpauly

Bronze Member
Joined
Nov 23, 2013
Messages
66
Location
Hertford Cty, NC
Tractor
Branson 3120R
Greetings. My post refers to a specific hydraulic pump - in my case a 2 pump Joyang F23 "stack" on a 2011 Branson 3120R - but I believe these pumps are used on many types of diesel equipment and my question I would think should be pertinent to many brands of pumps. So I recently replaced the Injector Pump on this tractor which required the removal of the gear case. Since I was in there and the tractor is coming up on 2000 hrs I decided to do some additional work such as replace the water pump and remove the subject hyd pumps so I could have a look inside and was pleased to see neither of the pumps (Main Hyd & Steering) showed any wear or defects. My question: having obviously lost some hydraulic fluid (at least that in the pumps and whatever leaked from the Hi & Lo Press lines) what is the best way to prevent cavitation of these pumps when I start the engine again for the first time? The tank/filter/pipes & lines and all other components are at a lower level on the tractor than the pump. I'm thinking by ensuring I replace the spilled fluid to the top of the tractor's sight glass it MAY get the level close to being sufficient to ensure "dry" pump operation will be at a minimum, but I just don't know. I have seen on youtube where some replacement pump mfg's recommend stuffing the pump(s) with petroleum jelly to remedy this situation. (The p.j. just melts once the pumps/fluid get hot and harmlessly mixes with the hyd fluid). Sounds like a plausible approach that I will probably try unless someone on here can assure me the brief time my pumps will be without oil is nothing to be concerned about OR there is a way recommended by the mfg I'm not aware of. Thanks in advance for any help here. I've learned a lot from reading the excellent posts/replies throughout this site.
 
   / Hyd Pump (Joyang F23) #2  
When you assembled the pumps back together, did you coat all of those internal parts with oil? If yes, I would just run it as is and not worry much about it.

If you put everything back together dry, it may be a good idea to pull the hoses above the pumps and fill them with oil just so they don't spin dry initially.
 
   / Hyd Pump (Joyang F23)
  • Thread Starter
#3  
ptsg: I did ensure a light coating of oil when reassembling. Reckon I could still try filling the pumps by removing one leg of the rubber "T" that feeds them (just not sure if the oil will run straight thru the pump to the outlet; but even with that as long as I start the engine soon after I guess [based on what you've indicated] I should be good to go.) Thanks for your input.
 
   / Hyd Pump (Joyang F23) #4  
It won't run much at all through the gears and it's definitely a good practice. It should prime fairly fast too.
 

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