Vmac PREDATAIR60 - Hydraulic System Data; Hydraulic Oil Type

VMAC – Vehicle Mounted Air Compressors
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6.0 Hydraulic System Data
Hydraulic System Pressure will vary considerably during compressor
operation (Figure 20). 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 PREDATAIR60) during startup with
cold oil.
0 2 4 6 8 10 12 14 16 18 20
3000
2000
1000
Time in minutes
H
y
d
rau
l
i
c pressure
1 2 3 4 5 6 7 8
OPERATION
1. Compressor warming up in unloaded state.
2. Compressor filling receiving tank, cold hydraulic fluid.
3. Compressor unloading.
4. No air consumption, compressor in unloaded state.
5. Brief use of compressed air, compressor tops up receiver and unloads.
6. No air consumption, compressor in unloaded state.
7. Sustained heavy air consumption, compressor maintains air pressure
then tops up receiver and unloads.
8. No air consum
p
tion, com
p
ressor in unloaded state.
Figure 20 – Hydraulic System Pressures
6.1 Hydraulic Oil Type
Use a premium quality anti-wear type mineral oil. Do not use
synthetic fluids. Consider the lowest overnight temperature for the
duration of the hydraulic oil in the system at all anticipated vehicle
locations:
• Extreme Cold Climate where temperatures are below -4°F (-
20°C)
• Cold Climate where temperatures are below 32°F (0°C), but not
lower than -4°F (-20°C)
• Temperate Climate where temperatures are above 32° F (0°C)