JLG 600A Service And Maintenance Manual page 241

ELECTRICAL DISPLACEMENT CONTROL ORIFICES
NOTE: The pump should have two control orifices located
under the servo covers.
1. With a 7/16" wrench, remove the five bolts from the
servo cover opposite the neutral adjustment (cover
without the adjustment screw).
2. With a 7/32" internal wrench, remove and inspect the
orifice.
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3. Remove the bolts from the servo cover on the neu-
tral adjustment side. Install a spacer or sprocket,
approximately 0.75 in. (19 mm) long, under the
servo cover opposite the neutral adjustment.
4. Re-install the bolts and tighten until the servo cover
on the neutral adjustment side of the pump sepa-
rates 0.125 in. (3 mm) from the housing. Turn the
cover and remove and inspect the orifice.
NOTE: The Displacement Control may first have to be
removed in order to rotate the servo cover.
5. Remove spacer, re-install orifices, gaskets, and cov-
ers. Torque grade 5 bolts 8 to 11 ft.lbs. (10.8 to 14.9
Nm) and grade 8 bolts 11 to 13 ft.lbs. (14.9 to 17.8
Nm).
– JLG Lift –
SECTION 5 - HYDRAULICS
5-31