Nexen RPG25A-GE486T 966740 - Manual (Page 13)

13 FORM NO. L-21235-G-0413
13. Clean the pinion flange and pilot where it will contact
the adapter (if used) or gearhead flange inspecting
for contaminates, burs, or surface defects that would
interfere with full contact between the pinion and
adapter (if used) or gearhead flange.
14. Apply a serviceable thread locking compound to the
pinion mounting screws and assemble the pinion to
the adapter (if used) or gearhead, leaving the mounting
screws snug but do not tighten at this time.
15. Position a dial indicator on the center of the pinion
rollers as shown in Figure 17 and zero it. Rotate pinion
a minimum of one complete revolution by turning the
gearhead input shaft while noting the amount of total
dial indicator runout and mark the angular location
on the pinion shoulder in which the highest reading
occurs throughout the rotation. When the pinion is
properly centered the concentric runout at the center
of the pinion rollers must be less than ± 0.030 mm [±
0.0010 in].
If the measured total indicator variance of the pinion
rollers is greater than ± 0.030 mm [± 0.0010 in], tap
gently on the O.D. of the pinion using a soft hammer
at the angular location in which the highest reading
occurred. Doing this will shift the pinion center closer
to the center of rotation.
16. Tighten the mounting screws to 50% of the specified
torque specified in Table 5 below in a star pattern that
allows for an even distribution of axial clamping force.
Then repeat the tightening pattern with 100% of the
recommended torque in Table 5.
Table 5
8. If the measured total dial indicator runout of the
adapter pilot bore is greater than 0.008 mm [0.0003
in], tap gently on the O.D. of the adapter using a soft
hammer at the angular location in which the lowest
reading occurred. Doing this will shift the center of
the adapter closer to the center of rotation.
9. Repeat steps 7 and 8 until the total dial indicator
runout is 0.008 mm [0.0003 in] or less.
10. Tighten the mounting screws to 50% of the specified
torque specified in Table 4 in a star pattern that
allows for an even distribution of axial clamping force.
Then repeat the tightening pattern with 100% of the
recommended torque.
11. Re-torque the mounting screws once more to the full-
specified torque value in Table 4 to ensure full torque
has been reached on all fasteners. Tighten in the same
order as above.
12. Repeat inspection Step 7 and verify the total dial
indicator runout listed in Step 8 is achieved after fully
torquing the adapter. If runout is out of specifications
the adapter should be removed inspecting for
contaminates, burs, or surface defects that would
interfere with full contact between the adapter and
gearhead flange. In some cases indexing the adapter
relative to the gearhead flange can be helpful. Then
repeat the adapter installation procedure starting with
Step 6.
Pinion Fasteners
Tightening Torque
Nm [in-lb]
RPS 16 (M3 x 0.5-APEX) 1.5 [13]
RPS 16 (M4 x 0.7) 5.3 [47]
RPS 20 (M5 x 0.8) 10 [88]
RPS 25 (M6 x 1.0) 17.5 [155]
RPS 32 (M6 x 1.0) 17.5 [155]
RPS 40 (M8 x 1.25) 40 [354]
RPS 4014 (M10 x 1.5) 70 [620]
Adapter Fasteners
Tightening Torque
Nm [in-lb]
ISO 16/20 (M5x0.8) 6.5 [58]
ISO 16/25 (M6x1.0) 11.5 [78]
ISO 20/25 (M6x1.0) 11.5 [78]
ISO 20/32 (M6x1.0) 11.5 [78]
ISO 32/40 (M8x1.25) 26 [156]
ISO 40/4014 (M10x1.5) 46 [273]
Figure 16
Table 4
Figure 17