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I purchased a used 391D CTL last fall and it just hit the 50 hour maintenance point. I got all of the points re-greased except 2, the 2 which connect the hydraulic ram to the boom on the rear of the machine. I raised the boom and locked the safety stud out and lowered the boom back down onto it. First, neither fitting would allow any grease in. My electric grease gun over pressure valve released on each side. I assumed I had 2 bad grease fittings. Today I pull them out, put them back on the gun and they work fine, the grease is flowing normally through them into the trash. Then problem #2 arrises: I can't get them threaded back into the holes straight. They go in smoothly and without resistance, they don't appear damaged due to cross threading. Does anyone have a clue what the heck I am doing wrong? Does the boom need to be in a different position?
 

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I gotta think your fittings are threading into a round surface. This can be quite frustrating trying to get them in straight, to say the least! Install them by hand until they're in there straight...and it may take 10 tries or more! Patience and perseverance is the ONLY way! Once they finally look straight and go in 3 or 4 turns by hand, put the wrench to them and then the grease gun.

As far as the fitting not taking grease, you could have old, hardened grease in your pin bore or the pin could be tight against the hole for the grease...try moving your boom(?) to a different position. Bob
 

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I gotta think your fittings are threading into a round surface. This can be quite frustrating trying to get them in straight, to say the least! Install them by hand until they're in there straight...and it may take 10 tries or more! Patience and perseverance is the ONLY way! Once they finally look straight and go in 3 or 4 turns by hand, put the wrench to them and then the grease gun.

As far as the fitting not taking grease, you could have old, hardened grease in your pin bore or the pin could be tight against the hole for the grease...try moving your boom(?) to a different position. Bob
Yes, the connection between the boom and the ram is rounded off on the side where the fitting is. I guess I'll keep trying to get them to seat properly. If I ever do I'll try moving repositioning the boom. Thanks.
 

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I have in the past had to resort to rigging up a fitting that would adapt to a "port-a-power" hydraulic pump. This is a hydraulic hand pump that puts out 10,000psi oil pressure. Enerpac is a big name brand as well. This was always rigged up on equipment that had either 1/8" or 1/4" NPT threaded holes for the grease fittings. If we could not get it to take grease in any position and the grease fittings were good, then we would force oil into the joint until something moved. Once the joint would take oil with reasonable ease, we would then re-install the grease fittings and proceed as normal.
 

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We use these Lincoln fitting cleaners. You fill it with WD40 and smack it with a hammer. It will clean out the holes and passages for grease to flow again.

LIN5805.jpg
 
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