JLG 340AJ, Service And Maintenance Manual

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SECTION 5 - HYDRAULICS
3121259 – JLG Lift – 5-49
3. Install the swashplate and bearings into the housing.
Ensure swashplate is in neutral position.
4. If removed, install new filter screens (B040) into housing.
Install screens in same orientation as when removed.
SERVO PISTON REASSEMBLY
1. Lubricate and install new piston seals and O-rings
(E025). Stretch O-rings onto servo piston, then install
piston seals outboard of the O-rings. Allow seals to relax
before installing servo piston. Use the servo cylinder to
resize the seals before installing servo piston.
2. Lubricate and install slider block (EOT 5).
SERVO PISTON INSTALLATION
Install servo piston assembly (E100). Ensure swashplate pin fits
properly in servo slider block (EOT5).
SERVO CYLINDER INSTALLATION
1. Lubricate new O-rings (E250) and install on each servo
cylinder.
2. While holding the servo piston in place, thread servo
cylinders into housing using a 3/4 in socket. Thread cyl-
inders equal distance in each side of pump until each
cylinder contacts servo cylinder. Do not compress servo
piston spring.
DO NOT ALLOW LOOSE SERVO PISTON TO DAMAGE INTERNAL MACHINED SUR-
FACES OF PUMP.
DO NOT DAMAGE SEALS WHEN INSTALLING SERVO CYLINDERS.
3. Install locking plates (E300). Using a 10 mm wrench,
install locking plate screws (E350). Torque screws to
13.2-16.1 Nm [9.7-11.9 Ib.ft.].