JLG 340AJ, Service And Maintenance Manual

Page: 227 / 370

SECTION 5 - HYDRAULICS
3121259 – JLG Lift – 5-67
Displacement Limiter Adjustment
If your pump has displacement limiters, you will find them on
either servo cover. You can limit forward and reverse displace-
ment independently.
NOTE: Displacement limiters are not pre-set by the factory. We
install them as far as possible without contacting the servo
piston. Limiting displacement requires clockwise adjust-
ment of the limiting screw.
BEFORE ADJUSTING THE DISPLACEMENT LIMITER, MARK THE POSITION OF
THE SERVO CYLINDER. BE SURE THE SERVO CYLINDER DOES NOT TURN WHEN
SETTING THE DISPLACEMENT LIMITER LOCKNUT.
1. Loosen the locking nut.
2. Rotate the adjusting screw to achieve the desired maxi-
mum displacement. Set the adjusting screw against the
servo piston by feel before counting turns. Refer to the
table below for change per turn. Clockwise rotation
decreases displacement, counter clockwise rotation
increases it. Adjustment is possible from zero to maxi-
mum.
3. After establishing the desired maximum displacement
setting, hold the adjusting screw while torquing the
locknut to the value in the table below.
4. Test operation of the vehicle/ machine to verify proper
maximum speed of vehicle/work function.
Table 5-16. Displacement Limiter Adjustment Data
Displacement
Locknut wrench size
and torque
Adjusting Screw Size
approximate
displacement change
per revolution of
adjusting screw
45 13 mm 23Nm[17lb.ft.] 4 mm internal hex 5.1 cm3 [0.31 in3]
53 13 mm 23Nm
[17 lb.ft.]
4 mm internal hex 6.0 cm3 [0.37 in3]