Gorman-Rupp Pumps 03H3-GR 285579 and up - Manual (Page 33)

OM−01201 0 SERIES
MAINTENANCE & REPAIR PAGE E − 13
Gearbox
NOTE
The following instructions for gearbox lubrication
are based on the air vent (4) being positioned as
shown in Figure 2. If the gearbox is reconfigured
and the air vent moved to another position in the
gear housing, use caution not to over-lubricate the
gearbox.
The gearbox was fully lubricated when shipped
from the factory. Check the oil level regularly at the
oil level pipe plug(s) (not shown) midway down the
side of the gearbox. When lubrication is required,
add SAE 90 weight non-detergent gear oil through
the hole for the air vent (4). Fill the gearbox until the
oil level reaches the bottom of the pipe plug hole in
the face of the gear housing. Clean and reinstall the
air vent plug and the pipe plug. Do not over-lubri-
cate. Over-lubrication can cause the bearings to
over-heat, resulting in premature bearing failure.
Under normal conditions, drain the gearbox once
each year. Add 1 ounce (29 ml) of ‘Molykote M’
Gear Guard, then fill with approximately 2 ounces
(59 ml) of SAE 90 weight non-detergent gear oil.
Change the oil more frequently if the pump is oper-
ated continuously or installed in an environment
with rapid temperature change.
Monitor the condition of the bearing lubri-
cant regularly for evidence of rust or mois-
ture condensation. This is especially im-
portant in areas where variable hot and
cold temperatures are common.
For cold weather operation, consult the factory or a
lubricant supplier for the recommended grade of
oil.