Nexen PRD750 966901 - Manual (Page 8)

FORM NO. L-21265-B-0312 8
LUBRICATION
Pinion
The pinion needle bearings are sealed and lubricated
for life and cannot be serviced.
Gear
Nexen recommends lubricating the gear teeth every
2 million pinion revolutions or 6 months, but it may
need to be lubricated more frequently based on the
application conditions, and observable tooth or roller
wear.
When lubricating the PRD system inspect the pinion
rollers and gear teeth for any abnormal wear patterns
and ensure the pinion rollers are not seized or have
excessive play. Wear on the edges of the gear teeth
(not uniform across the tooth face) or rings on the
rollers indicate an alignment problem which should
be corrected to obtain maximum system performance
and life. The rollers in new pinions can seem difficult
to turn due to seal drag. This improves as the pinion
breaks in.
THK AFA grease is recommended for gear tooth
lubrication. Nexen offers this grease under product
number 853901. Greases for special applications
such as food grade, vacuum, or others are allowed
if they use a synthetic base, a polyurea thickener,
and meet the following Kinematic Viscosity Levels:
CST@40C = 25; CST@100C = 5. Contact Nexen
for recommendations on alternative greases.
The PRD gear teeth can be lubricated in two ways:
1. Apply grease to the pinion rollers and roll the
pinion back and forth five times over one meter
circumference of gear teeth, repeating the process
until the entire gear is lubricated.
2. Using a swab apply a very small dab of grease on
the middle of each tooth face and rotate the ring
gear five times.
3. Wipe excess grease from the sides of the gear
and pinion body to prevent grease being thrown
off during operation and for general cleanliness.
Output Bearing
The output bearing is fitted with multiple grease
fittings on the inner race. See Figure 3.
The bearing manufacturer recommends that the
greasing be carried out during rotation at slow speed,
on two revolutions minimum, through all the grease
fitting locations.
The bearing should be greased every six months in
normal usage, every 150 hours when the application
conditions are severe such as an extremely dusty or
wet environment.
A light extrusion of the new grease must appear at
the protection seal lip.
Nexen recommends Mobilux EP2, shell retina EP2,
shell alva EPLF2 or equivalent. Contact Nexen for
recommendations on alternative greases for extreme
conditions.
Figure 3
Grease Fitting
Location