TM 5-3895-374-24-1
GP255FH
D. MAINTENANCE
1
Filters
Periodically clean all filters by accomplishing the following.
A.
Remove the filter by releasing the restraining screw located on the end of the filter.
B.
Clean the filter with a suitable solvent.
C.
Allow the filter to dry thoroughly.
D.
Dip the new filter in oil and allow it to drain thoroughly Use SAE 10-30 oil when ambient temperatures are
below 700F and SAE 30-50 oil when temperatures are above 70aF.
WARNING
If flammable solvents are used to clean a filter element for a blower supplying air for
combustion, be sure the element is completely dry before oiling. Make sure all excess oil has
drained from the element before reinstalling it on the blower. Combustible vapors drawn into
this type of air system can cause serious explosions.
E. Reinsert the filter in the mounting collar Securely fasten In place Ensure that the supporting leg (if present)
is properly positioned.
2.
Impeller Removal/Replacement
IMPORTANT
Upon receipt, carefully check the replacement impeller to be sure no damage has occurred
during shipment or handling Any changes made to the turbo blower assembly could cause
detectable differences in vibration levels. However, since each impeller is centrifugally
balanced before shipment to Quality Grade G6.3 of the ISO Standard 1940, impeller
replacement In itself should not cause concern. If excessive vibration level is suspected
before or after impeller replacement, obtain quantitative peak-to-peak displacement or
velocity vibration readings at the motor bearings prior to consulting the factory.
If it should become necessary to inspect and/or replace the impeller, the following procedures should be followed.
The numbers in parentheses refer to items In the drawing.
(page 3-543)
