UDRF01.04GB
Maintenance manual DRF 400–450
10 Common hydraulics – 10.4 Pumps
7
10.4
Pumps
page
–
Pumps, general
1. Hydraulic oil pump 1
2. Hydraulic oil pump 2
3. Hydraulic oil pump 3
4. Hydraulic oil pump 4
5. Brake oil pump
6. Pump cooling and filtering
The machine's hydraulics are supplied from six pumps. Four of them
for the working hydraulics, one for cooling and filtering of the hy-
draulic oil and one for the brake system. The pumps are assembled
to 2 pump banks. Each pump bank consists of two axial piston
pumps with variable displacement, and a gear pump with fixed dis-
placement. The pump banks are mounted on the transmission's
power take-off.
The axial pistons pumps are connected mechanically and hydrauli-
cally in pairs and can be considered as one pump (hydraulic oil pump
unit). Non-return valves make sure that the pumps don't interfere
with each other.
The left hydraulic oil pump unit (position 1 and 2) supplies the control
valve for lift and extension, pump 2 also supplies the attachment's
control valve. At boom in, pump 1 and 2 are disconnected.
The right hydraulic oil pump unit (position 3 and 4) supplies the steer-
ing system and the control valve for lift and extension. The priority
valve ensures that there is always pressure to the steering system,
the remaining flow goes to the control valve for lift and extension.
The left fixed pump (position 5) supplies the brake system's brake
and cooling circuit across an accumulator charging valve, see sec-
tion
4 Brakes
, group
4.3.1 Brake oil pump
.
The right fixed pump (position 6) continuously circulates the hydrau-
lic oil through the cooler and hydraulic oil filter.
001450
1
2
5
3
4
6
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Summary of Contents for DRD450-80S4X
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Page 60: ...UDRF01 04GB Maintenance manual DRF 400 450 2 1Engine https www forkliftpdfmanuals com...
Page 86: ...UDRF01 04GB Maintenance manual DRF 400 450 2 2Transmission https www forkliftpdfmanuals com...
Page 100: ...UDRF01 04GB Maintenance manual DRF 400 450 2 3Driveline axle https www forkliftpdfmanuals com...
Page 106: ...UDRF01 04GB Maintenance manual DRF 400 450 2 4Brakes https www forkliftpdfmanuals com...
Page 124: ...UDRF01 04GB Maintenance manual DRF 400 450 2 5Steering https www forkliftpdfmanuals com...
Page 130: ...UDRF01 04GB Maintenance manual DRF 400 450 2 6Suspension https www forkliftpdfmanuals com...
Page 150: ...UDRF01 04GB Maintenance manual DRF 400 450 2 7 Load handling https www forkliftpdfmanuals com...
Page 218: ...UDRF01 04GB Maintenance manual DRF 400 450 2 8 Control system https www forkliftpdfmanuals com...
Page 320: ...UDRF01 04GB Maintenance manual DRF 400 450 2 D Error codes https www forkliftpdfmanuals com...
Page 412: ...UDRF01 04GB Maintenance manual DRF 400 450 2 ESchematics https www forkliftpdfmanuals com...
Page 572: ...UDRF01 04GB Maintenance manual DRF 400 450 2 F Technical data https www forkliftpdfmanuals com...