Getting my 753 running again.. need hydraulic advice

[dieselfuelonly]

Hi everyone, I'm hoping to have my 2000 753 running again soon. I dropped my hydraulic control valve of at the dealer yesterdayand am going to have them finish the rebuild. To make a long story short, it started leaking, I bought a service manual myself, removed the control valve, started taking it apart, got it cleaned and started assembling it again and then ran into trouble. By the time I would have driven back and fourth to the dealer multiple times (its about an hour away), bought a couple specialty tools I would only use one time, etc., I decided to just let them finish putting it all back together. Despite them telling me multiple times that they wish I hadn't taken it apart because now they have to look at each part individually and figure out where it goes (come on yall, you're getting paid for it aren't you??), hopefully it will be finished soon and even if it costs a fair bit, at least the machine won't be sitting any more. Anyway, I plan to put the control valve back in myself. My problem is that the machine has been sitting since January of this year, and I know when I pulled the control valve out there was so much grease and grime that I'm sure some crud has fallen into some of the hydraulic lines. I don't want to hook everything back up and then have a few pieces of crud that fell into the lines tear up all the seals in the control valve again. What should I do to prepare for getting the lines cleaned out and starting up the machine for the first time in about 3/4 of a year? I have not changed the filter or fluid, when in the process should I do that? Thank you for any advice.

 

[Tazza]

The only way is to crack the line at the other end and blow air thought it. I personally use small pieces of foam and diesel and blow the foam throught the line and out the end. It pushes out any rubbish stuck in the tubeline or hose. The only draw back is you need to get the other end off to blow it through. It works pretty well though, i have done it quite a few times.
The rubbish won't cause damage to your seals in the control block, but it can cause pump damage. It needs to be cleaned out!
As for the control block and the dealer complaining. Its actually fair, they need to be sure all the parts are still there and correct or you could come back complaining that its leaking, so i do see their side. What special tools did you end up buying for the job? there is nothing special required for that job.... Seal picks is about all i can think that is “special” but you can use them for other orings and seals too.