JLG 340AJ, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3121259 – JLG Lift – 3-3
3.6 DRIVE MOTOR
Disassembly
1. Remove the drain plug (13) and washer (14).
2. Carefully place the motor in a vise and remove the two
seal plugs (33) from the end cover (32).
3. Remove the four bolts (34) from the assembly.
4. Lifting from below the port plate (23), carefully lift the
components from the port plate (23) up from the motor
assembly as a unit.
5. Separate the port plate (23) from the other components.
6. Remove the o-ring (19).
7. Remove the stop ring (24).
8. Remove the disc valve (25).
9. Remove the spacer (30).
10. Pour oil into the spacer hole and use a 0.56 in. (14.25
mm) mandrel as a piston to press up the pressure
plate(26).
11. Remove the guide pin (27).
12. Remove the o-rings (28 & 29).
13. Remove the crinkle washer (31).
14. Remove the valve drive (22).
15. Carefully lifting from under the gear set (20) to prevent
parts from dropping out, remove the gear set (20).
16. Remove the o-ring (19).
17. Remove the cardan shaft (18).
Assembly
1. Carefully lift from under the gear set to prevent parts
from falling out. Lay the gearwheel set so the o-ring
groove is upwards. Mark the wheel of the gearwheel set
at the point where the bottom of an internal tooth is
opposite the bottom of an external tooth.
2. Mark the tip of a spline tooth on the end of the valve
drive (22) with the widest splines. Line up the mark on
the rotor and valve drive (22). The end with the widest
splines must point upwards.
3. Grease the o-ring (19) with petroleum jelly. Install it in
the gearwheel (20) and channel plate groove.
4. Fit the channel plate (23) so the o-ring groove is
upwards and the check valve holes line up with the
through hole in the gear set.
5. Install the balls (35).
Out of Transport
Max Speed High-3000 RPM 22% Engaged 0.6 (1.0)
Min. Engine Noise Mid-1800 RPM 46% Engaged 0.6 (1.0)
Max Torque High-3000 RPM 22% Engaged 0.6 (1.0)
Table 3-2. Drive System Mode Chart
Boom Position Drive Selection
Engine Speed when
Drive is Actuated
Drive Pump
Displacement
Flow
Dividers
Max. Speed
MPH (kph)