Drive Hub - Bonfiglioli (S/N 100128 To Present); Product Identification; Hydraulic Motor Installation; Installation Of The Wheel Drive On The Machine - JLG 1200SJP Service Maintenance Manual

SECTION 3 - CHASSIS & TURNTABLE
3.12 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 Sec-
tion 3.13, Drive Hub - Reggiana Riduttori (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 dis-
tance 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.
3-20

Installation of the Wheel Drive on the Machine

1. Clean the mating surfaces from oils or paint and fit the
2. Attach the gearbox to the machine frame with the

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 PRESENCE OF RESIDUAL AIR IN THE HYDRAULIC CIRCUIT WILL BE REC-
OGNIZED 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
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
3. Check the correct revolution and direction of rota-
4. Make sure that the functioning is regular and without
Figure 3-15. Drive Hub Identification Plate
– JLG Lift –
wheel drive on the machine frame.
mounting bolts and torque to 178 ft.lbs. (241 Nm).
the tank if necessary.
increase it after having verified that it is functioning cor-
rectly without any noises or vibrations.
below.
tion.
any excessive noises and vibrations.
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