SHOP MANUAL
Ch 5 page 61
HYDRAULIC SYSTEM
Table of Correction Factors
Precharge Temperature t
0
°C
Operating Temperature t
2
°C
02- 01- 0 5 01 51 02 52 03 53 04 05 06 07 08 09 001
02-
00.1 40.1 80.1 01.1 21.1 41.1 61.1 81.1 02.1 22.1 42.1 82.1 23.1 63.1 04.1 34.1 74.1
01-
69.0 00.1 40.1 60.1 80.1 01.1 11.1 31.1 51.1 71.1 91.1 32.1 72.1 03.1 43.1 83.1 24.1
0
39.0 69.0 00.1 20.1 40.1 50.1 70.1 90.1 11.1 31.1 51.1 81.1 22.1 62.1 92.1 33.1 73.1
01
98.0 39.0 69.0 89.0 00.1 20.1 40.1 50.1 70.1 90.1 11.1 41.1 81.1 12.1 52.1 82.1 23.1
02
68.0 09.0 39.0 59.0 79.0 89.0 00.1
20.1 30.1 50.1 70.1 01.1 41.1 71.1 02.1 42.1 72.1
03
48.0 78.0 09.0 29.0 39.0 59.0 79.0 89.0 00.1 20.1 30.1 70.1 01.1 31.1 61.1 02.1 32.1
04
18.0 48.0 78.0 98.0 09.0 29.0 49.0 59.0 79.0 89.0 00.1 30.1 60.1 01.1 31.1 61.1 91.1
05
87.0 18.0 58.0 68.0 88.0 98.0 19.0 29.0 49.0 59.0 79.0 00.1 30.1 60.1 90.1 21.1 51.1
06
67.0 97.0 28.0 38.0 58.0 68.0 88.0 98.0 19.0 29.0 49.0 79.0 00.1 30.1 60.1 90.1 21.1
07
47.0 77.0 08.0 18.0 38.0 48.0 58.0 78.0 88.0 09.0 19.0 49.0 79.0 00.1 30.1 60.1 90.1
08
27.0 57.0 77.0 97.0 08.0 28.0 38.0 48.0 68.0 78.0 98.0 29.0 49.0 79.0 00.1 30.1 60.1
09
07.0 27.0 57.0 77.0 87.0 97.0 18.0 28.0 38.0 58.0 68.0 98.0 29.0 49.0 79.0 00.1 30.1
001
86.0 17.0 37.0 57.0 67.0 77.0 97.0 08.0 18.0 38.0 48.0 78.0 98.0 29.0 59.0 79.0 00.1
011
66.0 96.0 17.0 37.0 47.0 57.0 77.0 87.0 97.0 08.0 28.0 48.0 78.0 09.0 29.0 59.0 79.0
021
46.0 76.0 96.0 17.0 27.0 37.0 57.0 67.0 77.0 87.0 08.0 28.0 58.0 78.0 09.0 29.0 59.0
Example
The satisfactory operation of a hydraulic system requires a
precharge pressure of 100 bar. The operating temperature t
2
is
50°C and the temperature at precharging t0 is 20°C. From the
table, a correction factor of 0.91 should be applied, giving a
precharge pressure at 20°C of 91 bar.
Warning – Stabilization
The process of filling or discharging an accumulator with
nitrogen causes a temperature change which is transmitted to
the surrounding air as the temperature of the accumulator
stabilizes. To allow for the effects of temperature transfer, the
accumulator should be allowed to stand for a minimum of 15
minutes to allow the temperature to stabilize before a final
reading of the precharge pressure is taken.
Filling table of Correction Factors
Figure 55
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