Ed_Wischmeyer
Well Known Member
My A&P was having trouble putting grease into the two back fittings of the constant speed prop because of the spinner backplate. Are there any funny fittings that make that easier?
Thanks!
Thanks!
To make it easier to remember which zerks to remove, Hartzell now allows you to remove and discard the two zerks that get removed to allow old grease out, and replace them with plugs. The parts cost less than the shipping.
To make it easier to remember which zerks to remove, Hartzell now allows you to remove and discard the two zerks that get removed to allow old grease out, and replace them with plugs. The parts cost less than the shipping.
One other thing: new Hartzels come with a new grease, which is a bit hard to find. The new grease is NOT compatible with Aeroshell 5/6 so do not switch to the new grease unless you can completely clean the hub first.
Bob do you know if this is recent development? Mine is only about 2 years old and it came with Aeroshell 6 in and the manual says to use #6.
Bob do you know if this is recent development? Mine is only about 2 years old and it came with Aeroshell 6 in and the manual says to use #6.
Straight from Hartzell:
Beginning January 6, 2020, NYCO GN3058 is the preferred grease for Hartzell propellers. As of this date, all new production Hartzell propellers will ship with NYCO GN3058 grease. Prior to this change, Aeroshell 6 “all purpose” grease was used on all Hartzell new production propellers manufactured since 1989. (Exception: propellers installed on the Piaggio P180 and the Grob Egrett.)
A label is normally applied to the propeller to indicate the type of grease used. The same grease type must be used during re-lubrication unless the propeller has been disassembled and the old grease removed. NYCO GN3058 is not compatible with any of the approved Aeroshell greases. Do not mix different greases within a propeller.
Complete details can be found in Hartzell Service Letter HC-SL-61-366.
Looks like Spruce is carrying the Nyco grease now. 2 1/2 times more expensive than Aeroshell 6. Must be better, right?
You don't grease the back fittings, just remove them.
From Hartzell Manual:
B. Aluminum Hub Propellers
(1) Remove the lubrication fitting caps from both sides of the hub assembly.
Remove the lubrication fittings from either the cylinder side, or engine side of
the hub assembly.
NOTE: It is preferable to apply grease to the fitting located nearest the
leading edge of the blade on a tractor installation, or nearest the
trailing edge on a pusher installation. Greasing at this location
reduces the possibility of grease bypassing the bearing area and
entering the hub cavity.
(2) To prevent pressurization of the bearing cavity, use a piece of safety wire to
loosen any blockage or hardened grease at the threaded holes where the
lubrication fittings were removed
Also, from a Hartzell Service Bulletin HC-SL-61-366 I read these CAUTIONS:
CAUTION 3: DO NOT ATTEMPT TO PUMP MORE THAN 1 FL. OZ. (30 ML) OF
GREASE INTO THE LUBRICATION FITTING ON AN ALUMINUM
HUB PROPELLER. USING MORE THAN 1 FL. OZ. (30 ML)
OF GREASE COULD RESULT IN OVER SERVICING OF THE
PROPELLER. VERIFY THE OUTPUT OF THE GREASE GUN
BEFORE SERVICING THE PROPELLER.
CAUTION 4: OVER LUBRICATING AN ALUMINUM HUB PROPELLER MAY
CAUSE THE GREASE TO ENTER THE HUB CAVITY, LEADING TO
EXCESSIVE VIBRATION AND/OR SLUGGISH OPERATION. THE
PROPELLER MUST THEN BE DISASSEMBLED TO REMOVE THIS
GREASE.
I copied and pasted them here verbatim...must be important.
Several posts have referenced delivery of “new props” from Hartzell. Does any one know when the date is they started this application of installing the plugs. ?