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Page Title:
M88A2 Hercules main hydraulic system |
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 NAVAIR 17-15-50.4
TM 38-301-4
T.O. 33-1-37-4
CGTO 33-1-37-4
COMPONENT:
M88A2 Hercules main hydraulic system
LUBRICANT:
MIL-H-46170
Sn
Fe
Ag
Al
Cr
Cu
Si
Ni
Normal Range
0-3
0
0-1
0-1
0-1
0-16
0-5
0-1
Marginal Range
4-5
*
2
2
2
17-20
6
*
High Range
6
1
3
3
3
21-25
7-8
2
Abnormal
7+
2+
4+
4+
4+
26+
9+
3+
Abnormal Trend
(PPM Increase
2
*
2
2
2
5
2
1
in 10 hrs)
Pb
Mo
Mg
Ti
Na
Zn
B
Normal Range
0-1
0-2
0-7
0-1
0-10
0-52
0-2
Marginal Range
2
*
8-15
*
11-12
53-64
3
High Range
3-4
3
16-25
2
13-15
65-80
4
Abnormal
5+
4+
26+
3+
16+
81+
5+
Abnormal Trend
(PPM Increase
2
2
4
2
4
16
2
in 10 hrs)
TECHNICAL INFORMATION
Increasing silicon (Si) usually indicates contamination of the servicing
component oil system. A drain and flush of the hydraulic system, including
replacement of both the return circuit filter and the charge circuit filter, will
reduce abnormal silicon analysis readings.
The presence of iron (Fe) or iron and water (H2O) is probably rust occurring
as a result of condensation or internal oil pump and/or component wear;
such as cooler, quick disconnect valves, cross overlines, etc., since this is a
closed operating system. Components would include the cooler, quick
disconnect valves, cross-over lines, etc. Analysis readings of 1,000 parts
per million (PPM) or more of water in a hydraulic oil sample usually
warrants a recommendation to change oil and service or replace the filter.
The FT-IR test for the presence of water in EP additive fluids is observed as
a baseline rise or offset, but does not show the evidence of Tyndal-
particulate or colloidal scattering.
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