Nexen RPS16G-C0070T/360-EP2U 966554 - Manual (Page 9)

9 FORM NO. L-21252-B-1209
INSTALLATION
RING GEAR INSTALLATION
In the following section “ring gear” will be used to describe
solid ring gears, segmented ring gears, arcs, with internal
or external teeth unless otherwise specified.
If the ring gear will be oriented in the vertical plane precau-
tions should be taken to minimize the possibility that debris
could be deposited in the tooth pockets and interfere
with the pinion meshing. This can be accomplished with
shielding and if the ring gear rotates placing the stationary
pinion along the lower 120° of the ring gear to provide an
opportunity for debris to fall out of the tooth pockets before
arriving at the pinion.
RING GEAR MOUNTING SURFACE
VERIFICATION
1. Ensure that the mounting surface and ring are com-
pletely clean, free of burrs, or anything that could
interfere with full contact between the mounting sur-
faces.
2. Mount a dial indicator so that the ring gear can be
rotated past it as shown in Figure 3. Verify that the
radial variance in the ring gear mounting surface (ID
or OD depending on internal or external teeth) meets
the requirements of ±0.02 mm [±0.0008 in] as shown
in Figures 1 & 2. Repeat the procedure with the dial
indicator measuring the variance in the surface with the
mounting holes tangent to the plane of rotation to verify
it meets the requirements of ±0.02 mm [±0.0008 in]
as shown in Figures 2. Mark the high point in the sur-
faces as they are rotated. If either of these variances is
out of specification, attempt to correct it by adjusting
the bearings or other ring gear support structures. If
either variance cannot be brought into specifications
but is close, it may be corrected by shimming between
the ring gear and mounting surface, if the mounting
surface variance is only slight out of specifications.
Figure 3
Mark the variance on the ring gear with a grease
pencil or other easily removed marker at the high
and low points that should be opposite each other.
Rotate the ring gear so the dial indicator is resting
on the tooth peak with the low reading and zero it.
Place a wooden block on the high point tooth peak
and gently drive it towards the center of rotation half
the difference of the high and low variance readings.
Remove any variance markings on the ring gear and
repeat the tooth peak variance measurements again.
Repeat this procedure until the tooth peak variance
is within specifications all the way around the ring
gear. If the tooth peak variance cannot be brought
into specifications remove the ring gear mounting
bolts and rotate the ring gear relative to the mounting
surface and repeat the procedure starting with step
one.
3. Once ring gear variance is within specifications
drill through the dowel pin holes into the mounting
surface and pin into place if desired and provisions
are present.
SOLID RING GEAR INSTALLATION
1. Carefully place the solid ring gear onto its mounting
step, align the bolt holes, and insert the mounting bolts
and hand tighten them.
2. Measure the ring gear tooth peak variance with a dial
indicator at multiple points around the ring gear to
ensure that is concentric to the axis of rotation with
variance less than ±0.02 mm [0.0008 in] as shown
in Figure 3.
RPG
Size
Through Hole Mounting Tapped Hole Mounting Gear Mounting Hole E
A B C & D D Through Hole Bolt
16 9 M8 x 1.25 M6 x 1.00 M6-50 M6-50 M8
20 11 M10 x 1.50 M8 x 1.25 M6-60 M6-60 M10
25 14 M12 x 1.75 M10-20 x 1.50 M10-75 M10-75 M12
32 14 M12 x 1.75 M10-20 x 1.50 M10-95 M10-95 M12
40 14 M12 x 1.75 M10-20 x 1.50 M10-95 M10-95 M16
4014 14 M12 x 1.75 M10-20 x 1.50 M10-95 M10-95 M16