Monster Green: Dump Rebuild

Attention: Welcome to our new aircraft hydraulics section! We hope you find this section we have put together informative and interesting. You may notice that some part numbers and so forth are blurred out. One reason we didn’t want to post full part numbers because it has taken us months of searches to get the information we have. It wouldn’t be fair to us to just give up our hard work and research. Not too many people know about this stuff and the ones that do don’t want to talk about it. We feel this is just the right amount of info so we don’t upset anyone on either side. The biggest reason for not giving out full part numbers is because we don’t need every lowrider to call up aircraft surplus places looking for things. Most warehouses don’t want to sell to lowriders and the ones that do are raising their prices beyond a reasonable amount because people are willing to pay to much for stuff the warehouse considers junk. Lets keep prices down and think about it before you offer a insane amount for a used pump that needs a rebuild. If you are going to track parts down don’t say that it is for a lowrider. Know what the full part number is, what aircraft it goes in, the proper name for the part and the function of that part. Take the time to research the surplus industry and know the lingo they use. Remember not to use lowrider lingo when talking with them because odds are they have a different term for the part you are looking for. With a little research and some luck you’ll be able to find what you need.

Warning: If you are unsure about doing anything do not attempt the take apart the dump. Internal parts like the spool and sleeve must be flawless and not scratched. Remember the old saying ” if it isn’t broken don’t fix it. ”

When you own a dump like a Monster Green square you will see that the valve will eventually need new seals. Take extreme care in servicing one of these valves as they are not easily replaced.

In this section we will tear down a Monster Green square dump valve, replace seals and check the spool and sleeve. Lets take a look at how Jay rebuilds these dumps.

Remember where you saw it first!

Monster Green Dump Rebuild

This valve has been sitting for many years and needs a rebuild.

Monster Green Dump Rebuild

The lock wires are cut on the bottom bolts.

Loosen up the bottom bolts.

Loosen up the bottom bolts.

Lay the valve on a clean towel.

Lay the valve on a clean towel.

Unscrew the bolts by hand from the bottom of the valve.

Unscrew the bolts by hand from the bottom of the valve.

The solenoid top and the bottom part of the valve will separate from the valve body.

The solenoid top and the bottom part of the valve will separate from the valve body.

DO NOT LOSE THIS BALL BEARING!!!!!!!

DO NOT LOSE THIS BALL BEARING!!!!!!!

 The valve body from the bottom part.

The valve body from the bottom part.

Here is the plunger.

Here is the plunger.

Remove the plunger pin and take the plunger off and put it aside.

Remove the plunger pin and take the plunger off and put it aside.

Carefully remove the bottom sleeve from the valve using a pair of pliers.

Carefully remove the bottom sleeve from the valve using a pair of pliers.

Then remove the top sleeve and spool. Years of gunk was sitting on this important part of the valve and must be cleaned up. Carefully pull the spool out of the sleeve and replace the two small O-rings on the spool. Two O-rings will be replaced on the sleeve and one on the bottom sleeve/ bushing.

Then remove the top sleeve and spool. Years of gunk was sitting on this important part of the valve and must be cleaned up. Carefully pull the spool out of the sleeve and replace the two small O-rings on the spool. Two O-rings will be replaced on the sleeve and one on the bottom sleeve/ bushing.

Here is a normally open valve apart.

Here is a normally open valve apart.

Stocked up on O-rings. After cleaning out the valve body good put some O-ring lube in the valve body and reassemble your valve.

Stocked up on O-rings. After cleaning out the valve body good put some O-ring lube in the valve body and reassemble your valve.

Always remember to put a drop of light oil on the plunger

Always remember to put a drop of light oil on the plunger

The solenoid is screwed back on.

The solenoid is screwed back on.

This valve was tagged after repairs.

This valve was tagged after repairs.