2.3 Hydraulic Requirements
If the compressor is being installed on a truck that does
not have a hydraulic system, you will find information
on selecting and installing hydraulic components in
section 6.0 Hydraulic System Data.
Hydraulic System Pressure will vary considerably during compressor
operation (Figure 13). The system pressure varies between 900 and
2,400 psi during normal operation.
The pump must be rated for 1,900 psi steady operation and 2,600
psi intermittent to allow an additional 200 psi for pressure drop in the
hydraulic lines (external to the PREDATAIR) during startup with cold
oil.
Compressor capacity depends on hydraulic flow.
2.3.1 PREDATAIR60
For single speed operation a minimum of 14 GPM and a maximum of
20 GPM hydraulic oil flow is required. For two speed operation, a
minimum of 12 GPM and a maximum of 22 GPM hydraulic oil flow is
required (Figure 6).
2.3.2 PREDATAIR40
For single speed operation a minimum of 9 GPM and a maximum of
14 GPM hydraulic oil flow is required. For two speed operation, a
minimum of 8 GPM and a maximum of 15 GPM hydraulic oil flow is
required (Figure 6).
Nominal Air Flow vs Hydraulic Flow
0
10
20
30
40
50
60
70
12
11
10
9
8
13
14
15
16
17
18
19
20
21
22
Hydraulic Flow (GPM)
A
ir
Fl
o
w
(C
FM
)
PRE
DATA
IR40
PRE
DATA
IR60
Figure 6
VMAC – Vehicle Mounted Air Compressors
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