FLU419 SEE HMMH HME Owners group

[majkowskid]

Thanks for the help guys! Just ordered two belts online!

 

[glcaines]

I replaced the compressor head with a new one months ago and it appears to be working fine. However, you never know. I guess it is possible that the new head isn't working properly. Although the pressure regulator is holding the pressure at 106 PSI, it could also have an issue, as well as the alcohol injector. I need to do some serious troubleshooting to narrow the problem down.

Turns out the problem is with the unloader. I found a replacement on Ebay for $58.80 with free shipping. Hopefully I'll receive it soon because I have a project that needs the jackhammer.

 

[The FLU farm]

I had one give up on an HMMH.

Paid something like that, too. And they're easy to change. Forgot all about it until reading your post above.

 

[glcaines]

I had one give up on an HMMH.

Paid something like that, too. And they're easy to change. Forgot all about it until reading your post above.

Actually, the one that failed on mine was replaced by me several years ago. The model # I purchased for both is: WA9753034730A. I hope my new one holds up better. After removing the failed unloader, I noticed some corrosion in the steel fittings between the unloader and the crossover tube to the air tank. The crossover tube was previously replaced by me with a 316 SS 10 MM tube, so obviously no problem there. I like permanent solutions, and that 316 SS tubing was a permanent solution.

 

[glcaines]

I installed the new unloader. Took about one hour and everything works now. I did have to adjust the regulator to get the pressure up to 106 PSI. Maybe this one will last longer than the last replacement I did.

 

[glcaines]

Now that I have the air pressure issues resolved, I need to attack the problem that my alternator isn't charging and the tach, which is fed by the alternator, isn't working. Although the TM says I must tilt the cab to access the alternator, I seem to remember a post, either on SS or Benzworld, where someone was able to remove and replace the alternator on a FLU419 without tilting the cab.

 

[brandan34]

I seem to remember a post, either on SS or Benzworld, where someone was able to remove and replace the alternator on a FLU419 without tilting the cab.

I do not know the post, but I have done it. I installed a new alternator while cab was off, only to later find i wired the voltage breaker thing wrong. I had to remove the alternator to figure it out. I may have had the front of the cab lifted a few inches at the time, but I am fairly sure I did it while the cab was on all mounts. Either way no cab tilt was needed.

 

[The FLU farm]

Now that I have the air pressure issues resolved, I need to attack the problem that my alternator isn't charging and the tach, which is fed by the alternator, isn't working. Although the TM says I must tilt the cab to access the alternator, I seem to remember a post, either on SS or Benzworld, where someone was able to remove and replace the alternator on a FLU419 without tilting the cab.

Maybe try replacing the regulator first?

That's fully doable without lifting the cab. Not fun, but even I managed to get it done.

 

[glcaines]

Actually, I put a post on Benzworld about the problem. Several people responded and told me to check the charging warning light bulb. They said that voltage from the bulb goes to the alternator and is required to activate the alternator. My bulb checked out fine, but when I re-installed it, the alternator started charging and the tach started working. Apparently, there was a poor connection with the bulb. I had no idea that a faulty bulb could cause that problem. I am very happy that I didn't try to remove the alternator for repair.

 

[The FLU farm]

Oops. For some reason I thought you'd already checked the bulb.

I have one hanging loose from the wires under the dash on one vehicle, just for that purpose - to make the alternator kick on.

 

[Another Ahab]

Same problem a few days ago. Jam lever in the up pos then handyman jack did the trick for me. Once up set the things on the lift arms to hold it up.

My part is different than the one above, but does work. The belt that I copied I think I got from EI. Anyway just make sure the belt you get is a stronger kind.(not fractional horse power. Learned that the hard way.)

Amazon.com

That's a B****. But once you learn something that way, you'll never forget it!

 

[Knobby57]

I'm still in the middle of replacing the head on my compressor. I removed the old head with the wheel still in place which was not a difficult job. However, the new head I received from Estonia came with a much thicker head gasket and additionally a gasket to go between the cylinder and engine block, which the FLU 419 didn't have initially. I need to remove the cylinder and clean the sealing area on the block and also on the cylinder. It is virtually impossible without removing the wheel. I can't get any of the lug nuts loose to remove the wheel. I've use a 1/2 inch impact, a 3/4 inch impact and finally a 1 inch impact wrench. No help. I put a 3/4 inch drive impact socket on my 3-foot long torque wrench and none would come loose. I finally put a 2 foot long piece of pipe on the end of the 3 foot long handle on the torque wrench. I sheared the Chinese impact socket in half! My wheel is still on. Some of the lug nuts are now somewhat damaged. I think the next step is to heat the lug nuts with my acetylene torch. I've ordered new lug nuts, but haven't received them yet. It wasn't me that overtightened the lug nuts!

I may be a little late to this game, but I believe the gaskets on the compressor pump, a different thicknesses. There is a tolerance that needs to be kept I believe that I did read that in the manuals

 

[glcaines]

I may be a little late to this game, but I believe the gaskets on the compressor pump, a different thicknesses. There is a tolerance that needs to be kept I believe that I did read that in the manuals

You are correct. However, my new head came with a slightly thicker gasket and instructions that it would work for any situation. I hope it was correct, because that is what I did. So far no problems.