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GEAR REDUCER MAINTENANCE – GX MODELS
Failure to disconnect and lockout
electrical power or engine drive
before attempting maintenance can
cause severe personal injury or death
Hazardous
machinery can
cause serious
personal injury.
Failure to disconnect and lockout
electrical power before attempting
maintenance can cause shock, burns
or death
Hazardous voltage.
Can shock, burn or
cause death.
Failure to relieve system pressure
prior to performing pump service or
maintenance can cause personal
injury or property damage.
Hazardous pressure
can cause personal
injury or property
damage
Disconnecting fluid or pressure
containment components during pump
operation can cause serious personal
injury, death or major property damage
Hazardous pressure
can cause personal
injury or property
damage
If pumping hazardous or toxic fluids,
system must be flushed and
decontaminated, inside and out, prior
to performing service or maintenance
Hazardous or toxic
fluids can cause
serious injury.
Operation without guards in place can
cause serious personal injury, major
property damage, or death.
Do not operate
without guard
in place
Failure to allow gear reducer to cool
before attempting maintenance can
cause serious personal injury.
Extreme heat can
cause injury or
property damage.
NOTICE:
Maintenance shall be performed by qualified technicians
only. Following the appropriate procedures and
warnings as presented in this manual.
NOTICE:
Full load operating temperature of the gear reducer can
reach 180°F (82°C).
GEAR REDUCER LUBRICATION
NOTICE:
To avoid possible entanglement in moving parts do not
lubricate pump bearings, gear reducer or any other parts
while the pump is running.
NOTICE:
Blackmer gear reducers are not lubricated at the factory.
Oil MUST be added before initial pump start up.
Horsepower calculations for Blackmer reducers are based on
75°F (24°C) ambient air temperature; 200°F (93°C)
maximum oil temperature using synthetic oil.
Oil Change Schedule: For normal operation, the gear
reducer oil should be changed every 6 months or 1000
hours, whichever is shorter. If operating in conditions with
wide ranges in temperature, or in an unusually moist or dusty
atmosphere, the oil should be changed every 3 months or
500 hours, whichever is shorter.
Recommended Oil: Use a synthetic oil with oxidation
inhibitors that is compatible with Buna elastomers. Use
synthetic oil AGMA Viscosity Grade 4 or ISO Viscosity Grade
150 such as Mobil SHC 629, Mobil SHC 630, Shell Omala S4
GX 150, Castrol Isolube EP 150 or equivalent.
To add oil to the gear reducer:
1. Remove the oil level plug (29) and the fill & vent plug
(76C).
2. Add oil through the fill hole until oil runs out of the oil level
plug hole.
Pump
Model
Reducer
Model
Approx. Oil
Capacity *
GX2, GX2.5 HRO-GX 0.5 qt. (0.47 l)
GX3 HRA-GX 0.75 qt. (0.71 l)
GX4 HRB-GX 1.25 qt. (1.18 l)
* Capacity will vary depending on the orientation of the
reducer mounting.
3. Replace the oil level plug and fill & vent plug. Make sure
the vent fitting in the fill plug is kept clean to prevent
expansion from forcing oil leaks at the shaft.
NOTICE:
To maintain proper gear reducer lubrication, the vent
plug must be positioned higher than the oil level plug.
To determine maximum variation of gear reducer shaft
alignment, refer to Blackmer GX model dimension pages.
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