Hydraulic System; Functional Overview; Hydraulic Schematic - Nilfisk-Advance Advance Retriever 2060 Service Manual

HYDRAULIC SYSTEM

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FUNCTIONAL OVERVIEW

Hydraulic system
The heart of the hydraulic system is the hydraulic pump assembly mounted on the back of the engine. This pump is directly coupled
to the engine crankshaft and actually consists of two separate pumps, a propulsion pump and an accessory pump.
The propulsion pump is a variable displacement piston pump used to drive the wheel motor only. The pedal in the operator's compartment
uses a cable to move an arm on the side of the propulsion pump. The position of this arm determines the stroke of the pistons in the
pump, thereby controlling the volume and direction of the oil flowing to the wheel drive motor.
The accessory pump is mounted on the back of the propulsion pump. This pump provides the oil flow to power all the other hydraulic
systems on the machine. The 2060 / SR 1800 utilizes a dual gear accessory pump to provide two different flow rates to two different
hydraulic circuits. Since this pump is also directly coupled to the engine crankshaft (through the propulsion pump), the volume of oil
delivered by the pump will be determined by the speed (RPM) of the engine.
Maintaining the proper engine speed is essential for performance from the hydraulic system and the machine in general. If the engine
runs to slowly, the accessory pump will not provide the proper oil flow to run the motors at the correct speed and the machine will not
perform properly. If the engine runs to fast the pump will deliver too much oil, causing excessive system pressure and possibly damaging
the system components.
The 2060 / SR 1800 uses a fuel injection system, for both gas and propane models, that will control the engine speed. See the ENGINE
SYSTEM section of this manual for further information.
Relief Block
B
Bypass
(Towing)
Valve
Ford Engine
1.3L 2400 RPM
S A
Hydrostatic 2.49 CIR
B
A
Wheel Motor
Return Filter
24.0 CIR
249 RPM
0-9 MPH
25 PSI
OIl Cooler
Complete Hydraulic Diagram
50 - FORM NO. 56043051 / Retriever
Main
Broom
4.5 CIR
B A
L3
2500
PSI
P T
8.7
GPM
5.2
GPM P
Accessory
Pump
.84 .50
CIR CIR
Dual
Gear
Pump
1500
PSI
L1
D
Priority Divider T
11 Gal
SAE 10W30
Reservoir
™ 2060
L4
Hopper
Steer Cylinder 2 X 6
L R
T P Steering Unit
4.5 CIR
ST 2.0 GPM
DV
Manifold
Side
Broom
17.9 CIR
Impeller
.323 CIR
L2
Lift Cylinder
3 X 16.5
A
B
C
D
2400
PSI
Hopper
Dump
Lift
Door
T Directional Control Valve