F
OR
M
ODELS
: JGI, JGM, JGN, JGP
AND
JGQ
S
ECTION
4 L
UBRICATION
PAGE 4-16
than 50 feet (15 m) of oil piping, must be clean and while oil flushing is desirable for these
systems, it is not a requirement.
Prior to assembling the lube oil piping remove scale, weld slag, rust and any other matter
that could contaminate the lube oil.
Confirm:
•
The entire lube oil system is complete and closed.
•
The crankcase is filled to the correct level with the appropriate oil.
•
The proper lube oil filters are installed correctly.
•
The oil pressure transducer or gauge, oil filter differential-pressure transducers or
gauges, and oil temperature RTD or indicator are operational & values are viewable.
Start the pre-lube pump, record the oil pressure, oil filter differential-pressure and oil temper-
ature. Minimum measured oil pressure should be 30 psig (2.1 bar
g
) for effective flushing. Do
not exceed 90 psig (6.2 bar
g
).
A continuous hour of pre-lube flushing time must be achieved with an oil filter differential-
pressure increase less than 10% of the measured oil pressure into the filter. Record the oil
pressure, oil filter differential pressure and oil temperature at 15 minute intervals. If the oil
temperature increase is greater than 10°F (5.5°C) during an hour of flush time, it is not a
valid test of system cleanliness, due to oil viscosity change.
If the differential pressure or temperature increases exceed the limits in the paragraph
above, after an hour of pre-lube flushing, continue the flushing operation. Whenever the lube
oil filter differential pressure exceeds the change filter limits, stop the pre-lube pump and
change the oil filter. Re-set time and continue the flushing operation until a continuous hour
of flushing time is achieved within the differential pressure and temperature increase limits to
ensure system cleanliness.
T
ABLE
4-7 O
IL
F
LUSHING
C
LEANLINESS
R
EQUIREMENTS
ISO-4406 Grade 13/10/9
Grade Require-
ments
Particle Size
µm/mL Oil Sample
Number Particles
Allowed
/13
Greater than 4
40 to 80
/10
Greater than 6
5 to 10
/9
Greater than 14
2.5 to 5
NAS-1638 Grade 5
Particle Size Range
µm/100mL Oil Sample
Grade 5
Maximum Number Particles
5 to 15
8,000
15 to 25
1,424
25 to 50
253
50 to 100
45
Over 100
8
For all compressors with an oil piping
system greater than 50 feet (15 m),
cleaning and flushing must result in a
cleanliness level to ISO-4406, Grade
13/10/9 and/or NAS-1638, Class 5
(reference table), prior to starting the
compressor.
See table and ISO-4406 "International
Standard - Hydraulic fluid power - Flu-
ids - Method for coding level of con-
tamination by solid particles" and/or
NAS-1638 "National Aerospace Stan-
dard, Aerospace Industries Associa-
tion of America, Inc. - Cleanliness
Requirements for Parts Used in
Hydraulic Systems" for complete infor-
mation. Utilize a competent oil labora-
tory for sample testing.
