JLG 1250AJP Service Manual - Manual (Page 68)

SECTION 3 - 1CHASSIS & TURNTABLE
3-20 – JLG Lift – 3121171
3.13 DRIVE HUB - BONFIGLIOLI (S/N
100128 TO PRESENT)
NOTE: After S/N 0300134389 machines may be built with
either Bonfiglioli or Reggiana Riduttori wheel drive
hubs. See Section 3.14, Drive Hub - Reggiana Ridut-
tori (S/N 134389 to Present). Do not use different
hubs on the same machine.
Product Identification
The identification data of the hub is shown on a name
plates on the hub. Figure 3-15., Drive Hub Identification
Plate shows how the information is displayed.
The informations stamped on the name plates must
always be readable. Use the identification data (at least
serial number) for spare part enquiries, information and
service, etc.
Hydraulic Motor Installation
The mating areas and the pilot diameter of the gearbox
where the motor is to be mounted must be clean and
without burrs.
Before assembling the hydraulic motor, verify by a depth
slide gauge the correct assembly of the unit checking the
axial distance as shown in the scheme below as shown in
the scheme below.
1. Fit the O-ring seal, supplied with the gearbox, in its
seat in the hydraulic motor, and assemble it to the
gearbox being careful not to damage the seal
already fitted.
2. Torque the bolts to 63.5 ft.lbs. (86 Nm) torque.
Installation of the Wheel Drive on the
Machine
1. Clean the mating surfaces from oils or paint and fit
the wheel drive on the machine frame.
2. Attach the gearbox to the machine frame with
the mounting bolts and torque to 178 ft.lbs. (241
Nm).
Start Up and Running In
If new hubs are being installed, it is advised to follow the
measures given below:
1. Bleed air from every part of the hydraulic and add
oil in the tank if necessary.
THE PRESENCE OF RESIDUAL AIR IN THE HYDRAULIC CIRCUIT
WILL BE RECOGNIZED BY THE PRESENCE OF FOAM IN THE
TANK AND WILL LEAD TO A JERKING OF THE MOTOR AS WELL
AS EXCESSIVE NOISE COMING FROM THE MOTOR AND THE
VALVES.
2. Start the gearmotor at a low speed and gradually
increase it after having verified that it is functioning
correctly without any noises or vibrations.
DO NOT REACH MAXIMUM PRESSURE UNLESS THE ENTIRE
SYSTEM HAS BEEN FILTERED TO ELIMINATE ANY PARTICLES
OF DIRT THAT MAY BE PRESENT.
NOTE: During the running-in stage follow the steps given
below.
3. Check the correct revolution and direction of
rotation.
Figure 3-15. Drive Hub Identification Plate