6.0 Hydraulic System Data
Hydraulic System Pressure will vary considerably during compressor
operation (Figure 13). The system pressure varies between 900 and
2,500 psi during normal operation.
The pump must be rated for 1,900 psi steady operation and 2,800
psi intermittent to allow an additional 200 psi for pressure drop in the
hydraulic lines (external to the PREDATAIR) during startup with cold
oil.
0 2 4 6 8 10 12 14 16 18 20
3000
2000
1000
Time in minutes
H
ydr
a
uli
c pr
e
ss
u
re
1 2 3 4 5 6 7 8 9 10
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. No air consumption, compressor in standby state, hydraulic oil circulating through cooler.
10. No air consumption, compressor in standby state, hydraulic oil circulating through cooler.
6. Brief use of compressed air, compressor tops up receiver and unloads.
7. No air consumption, compressor in unloaded state.
8. Sustained heavy air consumption, compressor maintains air pressure
then tops up receiver and unloads.
9. No air consumption, compressor in unloaded state.
Figure 13 – Hydraulic System Pressures
6.1 Hydraulic Oil Type
Use a premium quality anti-wear type mineral oil.
!
Do not use synthetic fluids as the motor seals are not
compatible.
Consider the lowest overnight temperature for the duration of the
hydraulic oil in the system at all anticipated vehicle locations:
•
Extreme Cold Climate with temperatures below -4
°
F (-20
°
C)
•
Cold Climate where temperatures are below 32
°
F (0
°
C), but not
lower than -4
°
F (-20
°
C)
VMAC – Vehicle Mounted Air Compressors
Toll Free:
1-888-241-2289 Local: 1-250-740-3200
Fax: 1-250-740-3201
27
•
Temperate Climate with temperatures above 32
°
F (0
°
C)
