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  #1  
Old 04-06-2021, 07:56 PM
Ed_Wischmeyer's Avatar
Ed_Wischmeyer Ed_Wischmeyer is offline
 
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Default Greasing a constant speed prop

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!
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  #2  
Old 04-06-2021, 08:17 PM
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airguy airguy is offline
 
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uhhh.. shouldn't that be a tool that an A&P has??
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  #3  
Old 04-06-2021, 08:53 PM
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Walt Walt is offline
 
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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
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  #4  
Old 04-07-2021, 12:20 AM
BobTurner BobTurner is offline
 
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Location: Livermore, CA
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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.
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  #5  
Old 04-07-2021, 07:34 AM
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Ed_Wischmeyer Ed_Wischmeyer is offline
 
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Quote:
Originally Posted by BobTurner View Post
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.
Called Hartzell, and Bob and Walt are correct. Thanks! And the prop manual is on the Hartzell web site. (My prop is an experimental prop).

The plugs are $1.05, and Hartzell has a $20 minimum, but Hartzell referred me to a local prop shop.

The advantage of putting in plugs is that they are more robust than the zerk and less prone to breaking on removal.
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  #6  
Old 04-07-2021, 07:42 AM
Taltruda Taltruda is offline
 
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Location: Las Vegas, NV
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Always grease from leading edge to the trailing edge on a tractor prop installation. (Pusher props go the other way I think). Itís helpful to pull the plugs and dig abound in there with a piece of safety wire to loosen the hardened grease if thereís any that got hard. Your mechanic should know this and lubricant as per the manual.
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  #7  
Old 04-07-2021, 08:58 AM
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Ironflight Ironflight is offline
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Quote:
Originally Posted by BobTurner View Post
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.
And new Hartzells are being delivered with plugs in the trailing edge holes now, so its hard to screw up.....
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  #8  
Old 04-07-2021, 09:21 AM
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rocketbob rocketbob is offline
 
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Often I find mis-greasing or putting too much grease in a prop hub causes more problems than it solves. The big o-rings around the blades ride on "teflons" and too much grease causes the orings to open up and allow grease to spit out. Also causes balance issues.

If its not leaking grease, then there's no reason to grease it.

All the Hartzells I've opened up have grease in them that looked new.

The movement of the bearing balls is 1/8" at the most so the bearing assembly doesn't rotate enough to effectively distribute grease anyway.

Since it is a sealed system there are virtually no problems with grease contamination. Contrast that with the open bearings on a Hamilton Standard prop. Those require yearly maintenance of the pitch change bearings.
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  #9  
Old 04-07-2021, 01:11 PM
BobTurner BobTurner is offline
 
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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.
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  #10  
Old 04-10-2021, 09:40 PM
FlyinTiger FlyinTiger is offline
 
Join Date: Feb 2009
Location: Gilbert, SC
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Exclamation 1 oz. only

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.
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