JLG 800A_AJ ANSI Service Manual - Manual (Page 320)

SECTION 5 - HYDRAULICS
5-40 – JLG Lift – 3120740
5.12 REXROTH VARIABLE DISPLACEMENT
PUMP PRIOR TO S/N 0300121643
The variable displacement axial piston pump is a swash-
plate design for hydrostatic drives in open circuits. The
flow is proportional to the speed and the displacement. By
adjusting the swashplate, it is possible to vary the flow
steplessly. See Figure 2-43 for pressure settings and
schematic.
1. Variable, swashplate design SAE nominal pressure
3600 psi (248 bar), peak pressure 4600 psi (317
bar).
2. Pump, open circuit.
3. Displacement Vgmax 2.75 in 3 (45 cm 3 ).
4. Pressure and flow control. (DFR1)
5. Series 52.
6. Clockwise rotation.
7. NBR seals (Nitrile rubber to DIN ISO 1629)
8. SAE 1.00 in. (2.54 cm) splined shaft.(not suitable for
through drive)
9. SAE 2 bolt mounting Flange - SAE 101-2 (B)
NOTE: The Drive Pump and Displacement Pump must be
filled with oil before starting the engine. As the tank
is being filled, remove the specified plug from the
Variable Displacement Pump. As oil enters the tank
it flows to the pumps, fills them and flows out the port
where the plug was removed. Removing the plug
gives the air a place to escape. In approx. 5 min.,oil
should flow out the port. Replace the plug, the proce-
dure is completed.