CAMCORP HVP with Roots Blower - Manual (Page 55)

8
For Units with a Grease Lubricated Drive End
A simple but very effective lubrication system is employed on
the drive shaft end bearings. Hydraulic pressure relief fittings
are provided to vent any excess grease, preventing pressure
build-up on the seals. A restriction plug and metering orifice
prevent loss of lubricant from initial surges in lubricant pres-
sure but permit venting excess lubricant under steadily rising
pressures.
When servicing drive end bearings of Non Gas blower, use
the specified NLGI #2 premium grade microgel grease with
250°F (121°C) service temperature and moisture resistance
and good mechanical stability. ROOTS specifies Shell Darina
EP NLGI Grade 2. Product Code 71522.
URAI GAS Blower Oil and Grease Specifications
The specified oil should be ROOTS synthetic P/N 813-106- of
the proper viscosity.
When servicing drive end bearings of a Gas blower, use the
specified NLGI #2 premium grade aluminum complex*
grease, ROOTS P/N T20019001, with 300°F (149°C) service
temperature and moisture resistance and good mechanical
stability.
NOTE: Lithium based greases are not compatible with the
ROOTS Synthetic grease used when assembling a Gas blow-
er or the non-soap base grease used when assembling a
standard URAI blower. Lithium based grease is not
approved for any ROOTS blowers.
Using a pressure gun, slowly force new lubricant into each
drive end bearing housing until traces of clean grease comes
out of the relief fitting. The use of an electric or pneumatic
grease gun could force the grease in too rapidly and thus
invert the seals and should not be used.
After a long shutdown, it is recommended that the grease fit-
tings be removed, the old grease flushed out with kerosene
or #10 lubricating oil, drained thoroughly, and bearings
refilled with new grease. Be sure grease relief fittings are
reinstalled. Grease should be added using a hand operated
grease gun to the drive end bearings at varying time intervals
depending on duty cycle and RPM. Table 4 has been pre-
pared as a general greasing schedule guide based on average
operating conditions. More frequent intervals may be neces-
sary depending on the grease operating temperature and
unusual circumstances.
For Units with Splash Lubrication on Both Ends
Bearings and oil seals are lubricated by the action of the tim-
ing gears or oil slingers which dip into the main oil sumps
causing oil to splash directly on gears and into bearings and
seals. A drain port is provided below each bearing to prevent
an excessive amount of oil in the bearings. Seals located
inboard of the bearings in each headplate effectively retain oil
within the sumps. Any small leakage that may occur should
the seals wear passes into a cavity in each vented headplate
Lubrication
and is drained downward.
Oil sumps on each end of the blower are filled by removing
top vent plugs, Item (25), and filling until oil reaches the mid-
dle of the oil level sight gauge, Item (45 or 53), or the over-
flow plug (see pages 14 and 15).
Initial filling of the sumps should be accomplished with the
blower not operating, in order to obtain the correct oil level.
Approximate oil quantities required for blowers of the various
models and configurations are listed in Table 3. Use a good
grade of industrial type non-detergent, rust inhibiting, anti-
foaming oil and of correct viscosity per Table 2. *ROOTS syn-
thetic oil (ROOTS P/N 813-106-) is highly recommended.
ROOTS does not recommend automotive type lubricants, as
they are not formulated with the properties mentioned above.
The oil level should not fall below the middle of the site gauge
or overflow plug on URAI (ref. pages 14 & 15) when the
blower is idle. It may rise or fall on the gauge during opera-
tion, to an extent depending somewhat on oil temperature
and blower speed.
Proper lubrication is usually the most important single con-
sideration in obtaining maximum service life and satisfactory
operation from the unit. Unless operating conditions are quite
severe, a weekly check of oil level and necessary addition of
lubricant should be sufficient. During the first week of opera-
tion, check the oil levels in the oil sumps about once a day,
and watch for leaks. Replenish as necessary. Thereafter, an
occasional check should be sufficient. It is recommended that
the oil be changed after initial 100 hours of operation.
Frequent oil changing is not necessary unless the blower is
operated in a very dusty location.
Normal life expectancy of petroleum based oils is about 2000
hours with an oil temperature of about 180°F (82°C). As the
oil temperature increases by increments of 15-18°F (8°C -
10°C), the life is reduced by half. Example: Oil temperatures
of 210-216°F (99°C - 102°C) will produce life expectancy of
1/4 or 500 hours. Therefore, it is considered normal to have
oil change periods of 500 hours with petroleum based oils.
Normal life expectancy of ROOTS ™ Synthetic Oil is about 4000
to 8000 hours with an oil temperature of about 180°F (82°C).
As the oil temperature increases by increments of 15-18°F
(8°C - 10°C), the life is reduced by half. Example: Oil temper-
atures of 210-216°F (99°C - 102°C) will produce life
expectancy of 1/4 or 1000 to 2000 hours.
NOTE: To estimate oil temperature, multiply the discharge
temperature of the blower by 0.80. Example: if the discharge
air temperature of the blower is 200° F, it is estimated that
the oil temperature is 160° F.
*ROOTS™ Synthetic Oil & Grease is superior in performance to petroleum based prod-
ucts. It has high oxidation stability, excellent corrosion protection, extremely high film
strength and low coefficient of friction. Typical oil change intervals are increased 2-3
times over petroleum based lubricants. Also, ROOTS™ Synthetic Oil is 100% compatible
with petroleum based oils. Simply drain the oil in the blower and refill the reservoirs
with ROOTS™ Synthetic Oil to maintain optimum performance of your ROOTS™ blower.