Nexen RPG25A-GE486T 966740 - Manual (Page 12)

FORM NO. L-21235-G-0413 12
Table 3 Pinion Coupling Bolt Information
Model Bolt Size Tightening Torque
RPS10 M3 1.9 Nm [16.8 in-lb]
RPS12 M4 4.1 Nm [36.3 in-lb]
RPS16 M4 3.5 Nm [31.0 in-lb]
RPS20 M5 7.0 Nm [62.0 in-lb]
RPS 25, 32, 40 M6 12.0 Nm [106.2 in-lb]
RPS4014 M8 38.0 Nm [336.3 in-lb]
RPS50 M10 54.9 Nm [485.9 in-lb]
Flange Mount Pinion Installation (ISO 9409)
1. Clean the gearhead mounting face and pilot bore
inspecting for contaminates, burs, or surface defects
that would interfere with full contact between the
pinion and flange or cause runout.
2. Using a dial indicator, check the rotational flatness of
the face as shown in Figure 13. Position the contact
point of the indicator where the pinion will contact
it. Rotate slowly for a minimum of one complete
revolution and note the total amount of runout.
Figure 15
3. Position the contact point of the dial indicator at
bottom dead center of the pilot bore as shown in
Figure 14. Rotate slowly for a minimum of one
complete turn and note the amount of total runout in
one rotation.
10. Once the fasteners are fully torqued verify the pinion
is centered on the rack. If not, measure the positional
error and then remove the pinion as described in the
DISENGAGING THE ROLLER PINION section.
Repeat the pinion installation procedure and offset the
pinion by the recorded error plus the previous off set
value. When the pinion is fully torqued and properly
centered on the rack then verify pinion concentricity
at the center of the pinion rollers as shown in Figure
11. Indicated concentric runout on this surface must
be less than ± 0.030 mm [±0.0010 in].
4. If either of the following conditions are true, the
gearhead itself may contribute to excessive pinion
preload variation, a reduction in pinion life and/
or accuracy. The user should consider having the
gearhead re-worked or replaced.
a. The measured total variance of the mounting face
is greater than 0.013 mm [0.0005 in].
b. The measured total variance of the pilot bore wall
is greater than 0.005 mm [0.0002 in].
Note: In some cases an adapter will be required to
mount the pinion on the reducer. If so proceed with
Step 5, if not skip to Step 13.
5. Clean the adapter flange and pilot where it will contact
the gearhead flange inspecting for contaminates,
burs, or surface defects that would interfere with full
contact between the adapter and gearhead flange.
See Figure 15.
6. Apply a serviceable thread locking compound to the
adapter mounting screws then assemble the adapter
to the gearhead, leaving the mounting screws snug
but do not tighten at this time as shown in Figure 16.
7. Position a dial indicator at bottom dead center of the
pilot bore wall as shown in Figure 16 and zero the
indicator. Rotate the assembly slowly by using the
gearhead input shaft a minimum of one complete
revolution while noting the dial indicator runout and
mark the angular location in which the lowest reading
occurs throughout the rotation.
Figure 13
Figure 14
Pinion Side
Gearhead
Side
CAUTION
Preload must be applied before putting your
system into operation. Refer to APPLYING
PRELOAD to properly set preload for your
RPS system.