1962 520 Boiler Gear Oil Question

Stoker Coal Boilers automatically feed the coal and have controls and pumps just like any conventions boiler. They are intended to be used as a primary heat and often have domestic hot water coils as an added bonus. They can be set up independently or in dual sytem with your existing oil/gas boiler. They can accommodate both hot water base board or steam plumbing.
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Joined: Sun. Sep. 21, 2008 6:44 pm
Coal Size/Type: rice
Stove/Furnace Make: EFM
Stove/Furnace Model: 520
Location: North East Corner of CT.

Post Tue. Nov. 27, 2012 10:30 pm


Would like to know what to use for gear oil in the 520 gear box? Also is there another area that needs lubrication fluid?

Normy (Jon)

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Hand Fed Coal Boiler: 1981 efm wcb-24 in use 365 days a year
Coal Size/Type: Anthracite/Chestnut
Other Heating: Hearthstone wood stove
Location: Lehigh Valley, PA

Post Wed. Nov. 28, 2012 5:28 am

In the old cast iron gearbox, with an elbow at the bottom, 20W oil was used.

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Rob R.
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Joined: Fri. Dec. 28, 2007 4:26 pm
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy
Location: Chazy, NY

Post Wed. Nov. 28, 2012 6:52 am

80w90 or 75w-90 gear oil works fine in any of the S-20 gearboxes, and also in the oil bath below the drive gear.

More info in this thread: Stoker Gearbox Oil for the Old Cast Iron Boxes

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