Gearhead Misc - When Does the Gearhead Oil Need to Be Changed?

All Parker gearheads ship lubricated unless ordered as custom.

Lubrication change is typically not necessary and the seal will need to be changed before the lubrication needs to be changed. For the most part, you can leave the lubricant in for the life of the product as long as the gearbox is not leaking.

Typically the only time the lubricant breaks down is if it is exposed to extreme conditions (temperatures).

Seal life is more dependent on friction wear of the seal lip against the rubbing surface, such as the output seal rubbing against output shaft, input seal rubbing against the out diameter of the pinion gear. O-rings don't typically wear out between housing surfaces but can dry at elevated temperatures (180C).

Temperature can also play a role in it over time. The proper oil fill within the gearhead engages the seals and prevents premature seal failure.

GEARBOX LUBRICATION

Gearhead	Lubricant	Manufacturer	Description
All Stealth Gen II gearheads	SHC630	Mobil	Wide temperature synthetic oil for gears and bearings. Orange in color.
Stealth Gen I gearheads after July 2002	SHC630	Mobil	Wide temperature synthetic oil for gears and bearings. Orange in color.
Stealth Gen I gearheads until July 2002	Synthetic Nyogel 792D	Nye Lubricants	Wide temperature synthetic grease for gear trains, gear motors and planetary gears. White in color.
PV gearheads	Synthetic Rheolube 363AX-1	Nye Lubricants	Formulated for wide temperature stability and to reduce oil separation. Olive to light brown in color.
PG and RA (60 and 90) after 2002	Mobil 28	Mobil	Wide temperature synthetic grease for gears and bearings. Red in color.
PG and RA (115 and larger) after July 2002	Synthetic Nyogel 792D	Nye Lubricants	Wide temperature synthetic grease for gear trains, gear motors and planetary gears. White in color.
PG and RA until July 2002	Mobil 28	Mobil	Wide temperature synthetic grease for gears and bearings. Red in color.
NEMA gearheads (NE and NR)	Synthetic Rheolube 363AX-1	Nye Lubricants	Formulated for wide temperature stability and to reduce oil separation. Olive to light brown in color.
Vacuum-rated	Synthetic Nyogel 717C	Nye Lubricants	Vacuum rated and useful for high temperature electrical contacts.
Low temperature applications	Synthetic Flouroether Grease 899S-1	Nye Lubricants	High Temperature stability and wide temperature fluidity.
Certain Stealth Gen I gearheads (142 and larger)*	Synthetic Gear Oil 345	Nye Lubricants	Formulated for wide temperature service and heavily-loaded applications.

Very few Stealth Gen I gearheads ever used Synthetic Gear Oil 345. It is not commonly encountered.

STEALTH GEN II OIL FILL

Gearhead	Single Stage (10:1 or less)	Dual Stage (12:1 to 100:1)
RS60 / RX60 / RX23	58 mL	58 mL
RS90 / RX90 / RX34	160 mL	160 mL
RS115 / RX115 / RX42	340 mL	340 mL
RS142	760 mL	760 mL
PS60 / PX60 / PX23	28 mL	48 mL
PS90 / PX90 / PX34	62 mL	105 mL
PS115 / PX115 / PX42	130 mL	220 mL
PS142	200 mL	450 mL

Parker gearheads are precision gearheads and should not be disassembled in the field. We do offer repairs and an expedited service for urgent repairs. Contact your local Parker Automation Technology Center (ATC) for repair Return Material Authorization (RMA) number to have the gearhead serviced.

For the Stealth Gen I oil fill level, see the user guide (on the product page).

Before July 2002, the Stealth Gen I gearheads part numbers either ended with nothing after the ratio for standard backlash units, or -LB for low backlash units.

After July 2002, the Gen I gearheads were internally redesigned for oil fill for longer life. The part numbers then ended in -SH, -SU, -SD, -SE, -SF for standard backlash and the orientation (horizontal, up, down, E/F for right-angle); or for low backlash units -LH, -LU, -LD, -LE, -LF.

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