Nexen PRD1500 966903 - Manual

Precision Ring Drive with Removable Pinion
Precision Ring Drives containing the removable pinion option should follow this document
for servicing of the pinion and setting preload. For all other installation instructions, refer to
Nexen literature 21265.
LINEAR MOTION CONTROL PRODUCTS
Install & Maintenance Supplement
1
PINION REPLACEMENT AND PRELOAD
Installation:
1. Clean the gearhead mounting face and pilot bore
inspecting for contaminates, burs, or surface defects.
2. Check the runout of the gearbox pilot bore and face.
Both items should be less than 0.008 mm.
3. Clean the pinion flange and pilot where it will contact
the gearbox.
4. Apply serviceable thread locking compound to the
pinion mounting screws and install the pinion.
5. Position dial indicator on the center of the pinion rollers
as shown in Figure 2 and zero it. Rotate the pinion a
minimum of one complete revolution noting the runout
on the top of each pin. When the pinion is properly
centered the concentric runout at the center of the
rollers must be less than +/- 0.030 mm.
6. Tighten the mounting screws to 8.5 Nm in a star pattern.
Then repeat the tightening pattern to 17.5 Nm. Check
pinion runout one more time to ensure it did not move
during tightening.
7. Slide pinion/preloader gearbox setup into contact with
the gear, do not force them together, preload will be
set in the upcoming steps.
Figure 2
The PRD is delivered with the proper preload from the
factory. If pinion service is required, the following will guide
you through the process of pinion replacement and preload.
Removal:
1. To replace pinion, loosen, do not remove, the four
preload screws (Item 1) as shown in Figure 1. Leave
the screws just loose enough so the plate will slide.
2. Remove preload by turning the preload bolt (Item 2)
clockwise as shown in Figure 1. The screw is only for
pushing the pinion into gear, turning screw clockwise
will not pull the pinion from the gear, it only removes
the system tension. Turn screw until it bottoms out.
3. Remove the six screws (Item 3) to remove the preload
adjust plate (Item 4).
4. Slide the preload plate/pinion/gearbox assembly out
of tooth mesh.
5. To remove the pinion, remove the six screws (Item 5).
Figure 1
Item 2
Item 1
Item 4
Item 3
Item 5