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 Adel 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. This section could also be used for the rebuild of Adex valves but it is HIGHLY not recommend because opening your valve will void the warranty.
In this section we will tear down a Adel square dump valve, inspect / replace seals if necessary and check the spool and sleeve. Lets take a look at how Jay rebuilds these dumps.
Remember where you saw it first!
This job required special tools. A brass sleeve / spool extractor, brass O-ring removal tool, set of punches, toothbrush and O-ring lube all help make the job easy.
These valves are very hard to come across. If you have one we will show you how to service it.
Cut the lock wire to the solenoid.
Cut the lock wire to the bottom plate.
Remove the four screws at the candle and remove the solenoid.
Notice the pin inside this Bendix solenoid.
The connector when it was cleaned up shows the Bendix stamping.
Another Bendix connector.
Notice the pin that must be removed from the plunger.
Carefully remove the pin from the plunger using a small nail and hammer. Gently tap out the pin.
Here is the top of the valve with the plunger removed.
Remove the four screws for the bottom plate.
Twist the bottom plate until one of the corners is near the side to make removal easy by hand. NEVER pry off the bottom plate with any tools.
Here is the bottom plate removed.
Remove the bottom plate, retainer and O-ring. Then remove the shaft.
Back to the top of the valve body. Remove the retainer by hand and remove the O-ring.
The spool is carefully removed using a brass rod 1/16″ thick by inserting it into the small hole in the top of the valve body. Gently guide the spool out of the bottom of the valve. USE EXTREME CARE IN REMOVING THE SPOOL. NEVER INSERT ANYTHING ELSE OTHER THAN THE BRASS ROD IN THE VALVE BODY.
The spool is removed from the valve body.
The 1/16″ thick brass rod is inserted again into the top of the valve body. You want to touch to very top of the sleeve and flip the valve body over with the brass rod resting on the bench gently push the the valve body down until the sleeve begins to come out of the body. Once the sleeve is half out you can pull it out by hand. USE EXTREME CARE IN REMOVING THE SLEEVE. NEVER INSERT ANYTHING ELSE OTHER THAN THE BRASS ROD IN THE VALVE BODY.
The sleeve is removed.
Use your pinkie finger to remove the O-ring, Teflon back up and aluminum retainer. Also remove the spring.
The valve apart.
Parts inside the square dump.
The sleeve and spool soak in a cup of our special light oil blend for valves.
The part number and model number along with the Adel stampings prove beyond a doubt this valve is the real thing.
Here are the old O-ring on the spool. Notice the leather O-ring back ups, this is a sign this valve is old.
New O-rings are reinstalled on the sleeve.
The spool is taken out of the light oil blend.
The spool is carefully reinserted into the sleeve using some light oil blend.
Inside the the valve body is coated in a light coat of either Parker Lube, Vaseline, or bearing grease.
This is how the spool, sleeve and spring should look prior to installation back in the valve body.
The body is slowly pushed downwards onto the spool / sleeve assembly.
Use your two thumbs to install the sleeve in the body all the way.
The end plate O-ring is changed along with the bottom shaft O-ring.
The shaft is installed back in the valve body.
The bottom plate is screwed in.
The plunger is pressed back on after replacing the upper shaft O-ring and retainer.
The valve is lock wired again.
Here are the old seals.