3000 - Lift Cover rebuild - advice please

I am about to install a hydraulic pressure tapping manifold to facilitate adding my FEL. This is the “pressure in” and “pressure out” manifold that installs on lift cover in same position as remote valves. I recently bought the 3000 and thought it might be a good idea to rebuild lift cover while I am at it. I finally got the courage to pull my lift cover today and begin the adventure of rebuilding. I have several questions concerning this procedure – so all of the experts – please give me some feedback!!

I have two different service manuals and I think I understand most of the procedures, however, I did notice that there are several procedures that call for special tools to do the work. Questions below –

1. Lift Cylinder Safety Valve – what would be the symptoms of faulty valve – should I do anything??
2. Lift Cylinder Piston and seals – I plan on changing the ring. I bought a lift cylinder overhaul kit and it does not seem to have a leather backup ring but does have what appears to be a “white” fiber ring??? Any think special to check??
3. Control Valve and bushing – special tool to remove – do I need to do anything??
4. Unloading valve – special tool – any symptoms??
5. Check Valve – on front edge of life cover – anything to check??
6. Lift control linkage – Would you do anything??

The only obvious thing I saw was the end of the spring on the flow control linkage is broken where it connects to the tube that has the “suction” filter. I plan on getting a new spring from NH.

Long story short – When you do this operation are there certain things that you make sure and check, replace?? I do not what to make this any more complicated than necessary.

Sorry for the long post – Can you guys help??

Stash

If the leak from the o-ring from the back of the piston housing, replace that and do not touch anything else, other than replacing all o-rings and checking the cam follower pin. If the leak is from the front of the unit, then it is probably one of the valve.

I would check the check valve first. The check valve is a simple steel ball that can be accessed without removing the heavy lift cover. Replace it in any event as it is only 50 cents at any hardware store. The check valve seat is a major pain to remove as you will need to remove the cover and obtain or make a special puller to access the seat. See the manual. Try the new steel ball first.

The last thing I would suspect is the control valve and bushing. In any event, the bushing can be difficult to remove. It can be pressed or hammered out but make sure that the valve is pulled first, that you do not score or damage the interior of the unit, and that you replace the bushing with the same color bushing. Valve and bushing is around $55.

The safety valve is accessed from the top of the lift cover and only the cover plate needs to be removed. I would replace this if the orings, check valve replacements do not fix the problem. $50 part.

The unloading valve ring should only be replaced if you are having problems with the unit sticking in the up or down position. It will not usually cause a leak down. The unloading valve plug, however, will allow a leak down if it is worn and fluid is allowed to escape around it. The plug is only a press fit in. Replace the plug with the next size larger if need be.

Good luck and keep us posted.

Can you help??