Howden Roots 2500 Series WHISPAIR MAX, Installation, Operation And Maintenance Manual

ISRB

 2005 GEA 20260

Page 11 of 24

 
 
 
 
 
 
 
 
The oil sump on the gear end of the blower is filled by 

removing top plug Item (140), and filling until oil flows 

from overflow plug, Item (111). 
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 
2500 Series blowers with grease lubricated drive end 

bearings. 
When servicing drive end bearings of use the 

specified and recommended Shell Darina SD 2 NLGI 

#2 product code 506762B. 
For grease lubricated drive end blowers see Table 1, 

page 9, regarding specified greasing intervals. 
Lithium based greases are not compatible with the 

specified and recommended Shell Darina SD 2 

grease used when assembling the blower. Lithium 

based grease is not approved for any Roots blowers. 
Table 3, page 9 has been prepared as a general 

greasing schedule guide based on average operating 

conditions. More frequent intervals may be necessary 

depending on the grease operating temperature and 

unusual circumstances. 
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 

pressure but permit venting excess lubricant under 

steadily rising pressures. 
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. 
Gear end bearings, gears and oil seals are lubricated 

by the action of the timing gears 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 and is drained downward. 
Proper lubrication is usually the most important single 

consideration in obtaining maximum service life and 

satisfactory operation from the unit. Unless operating 

conditions are severe, a weekly check of oil level and 

necessary addition of lubricant should be sufficient. 

During the first week of operation, 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. 
More frequent oil service may be necessary if the 

blower is operated in a very dusty location. 
*Roots Synthetic oil is superior in performance to 

petroleum based products. It has high oxidation 

stability, excellent corrosion protection, extremely 

high fi lm 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. 

ISRB 2005 GEA 20260.indd   11

17/09/2015   12:53