Installation Of A Gear Box; Installation Instructions; Models 700, 712, 721, 732, 741 And 2230 - Parker 732 Series Owner's Manual

Bulletin HY25-1900-M1/US

Installation of a Gear Box

Installation Instructions – Gear Boxes Models 700, 712, 721, 732,741, 2230
Gear boxes are installed very similarly to split shaft Power Take-Offs. The differences are that the gear box
is driven from a Power Take-Off rather than the transmission main shaft, and the gear box drives a piece of
equipment rather than the rear axle. Installation of a gear box requires fabrication of new shafts rather than
cutting into the existing driveline. Listed are the necessities for a good gear box installation which are basically
the same as those required for a good split shaft Power Take-Off installation. The unit itself is mounted on a plate
which must be mounted to a sturdy support on the vehicle. Rubber isolation of the unit is important to prevent
transmitting vibrations throughout the vehicle. Then follow the steps below:
1. Front - The short coupled joint connecting the Power Take-Off to the gear box should be installed so as to
permit equal joint angles of less than 3°.
Rear - The two joint assembly connecting the gear box to the driven equipment should be installed so as to
permit equal joint angles of less than 5°. To ensure the best performance, the joint angles should be kept
within a minimum of 1° to 3°.
Front & Rear - The two joint assemblies at the front and rear should be installed so as to permit equal joint
angles of less than 5°.
2. Determine a suitable location for mounting the gear box. Raise or lower or move the gear box front or rear as
required to reduce the joint angles to a minimum, but not less than 1°.
3. Align the gear box with the Power Take-Off and driven equipment.
A. For the best installation and optimum performance, the input and output shafts of the gear box should
be parallel respectively with 1° to the output shaft of the Power Take-Off and the input shaft of the driven
equipment.
B. With the shafts parallel, the joint angles should be in one plane only. Make sure the offset in the horizontal
or vertical planes will provide for equal joint angles of less than 3° with a short coupled joint or less than 5°
with a two joint assembly.
4. Excessive angles result in a loss of speed and power. The figures shown below are approximate and any
angles less than those shown will provide a better installation.
Speed
5,000 RPM
4,000 RPM
3,000 RPM
Slight angles of 1° in each joint are necessary to permit circulation of the needles.
5. If at all possible, the shafts front and rear should be assembled, straightened, and balanced. The various
models of gear boxes offer three (or several) types of shifters. Wire shift is installed identically to a six bolt
Power Take-Off installation. Linkage for lever controls must be designed and fabricated by the installer. Air shift
plumbing is shown in the typical sketch on
True Joint Operating Angle
3° 15'
4° 15'
5° 50'
page 21
Owner's Manual
Legacy Split Shafts and Gear Box
for a single acting air shift.
11 Parker Hannifin Corporation
Chelsea Products Division
Olive Branch, MS 38654 USA