Sheffer MH SERIES - Manual (Page 8)

WF
FF
XS
WF
FF
EX
EO
WF
G
W
FF
XG
FF
K
XT
K
WF
FIGURE A
FIGURE B
FIGURE C
FIGURE D
WF
FF
K
G
FIGURE E
VARIANCES
Construction
Variances in Construction
There is a construction variance in the
1
1 / 8 ", 1 1 / 2 ", and 2" bore sizes, and the
2 1 / 2 " bore with the 1 3 / 8 " and 1 3 / 4 " rod
diameters, and the 3 1 / 4 " bore with a 2" rod
diameter. The round rod gland retainer
shown on the preceding pages is not
employed on these sizes. A square retainer,
the same square size as the head is used
instead.
Side Lug (SL) and Centerline Lug
(CL) Mounts – The retainer is held in
place with retainer screws that thread into
the head. The rod gland can be removed
without loosening the tie rods in all sizes.
See Fig. A.
End Lug (EL) Mount – The bottom two
tie rods utilize the lugs as nuts and the top
two tie rods have tie rod nuts. The rod
gland cannot be removed without
loosening the tie rods. See Fig. B.
Trunnion Front (TF) and Trunnion
Rear (TR) Mounts – The retainer is held
in place by retainer screws that thread
into the head and the rod gland can be
removed without loosening the tie rods
in all sizes. See Fig. C.
Intermediate Trunnion (T) Mount –
The retainer is held in place with tie
rod nuts and the rod gland cannot be
removed without loosening the tie rods
in these sizes. See Fig. C.
Clevis (C) Mount – The retainer is held
in place with tie rod nuts and the rod
gland cannot be removed without
loosening the tie rods in 1
1 / 8 " and 1 1 / 2 "
bore sizes only.
Side Flush (SF) Mount – The retainer is
held in place by retainer screws that thread
into the head and the rod gland can be
removed without loosening the tie rods in
all sizes. See Fig. D.
Trunnion Mounts Note:
Pillow blocks of ample size and rigidity
should be provided and should be
mounted as close to the head or cap as
possible. Bearing should be provided for
the full length of the trunnion pin.
All trunnion cylinders need provision
on both ends for pivoting in one plane.
Alignment in the other direction is
essential to avoid excessive side loading.
Where two-direction pivoting is necessary,
consult with our distributor for specific
recommendations. Do not use spherical
bearing Pillow Blocks.
End Lug Note:
When specifying an End Lug mount,
carefully check the distance between the
rod end and the lug to determine suffi-
cient clearance for the rod end attach-
ment. It may be necessary to add extra
plain rod extension to move the threaded
rod end out beyond the lug.
Side Lug Note:
When specifying a Side Lug mount with
the ports on the side (port positions 2, 4,
6 or 8), be sure that there will be enough
clearance between the port fitting and the
lug to insert a bolt or cap screw into the
lug. In small bore sizes, it may be
necessary to employ a pipe nipple to
easily pipe the port.
Variances in Construction –
Flange Mount Cylinders
There is a construction variance in some
bore and rod size combinations where it
is not possible to utilize the round, cap
screwed, rod gland retainer. Affected
dimensions can be determined by Fig. E.
Front Flange (FF) and Front Flange
Extra (FFX) Mounts – On the bore and
rod combinations affected, the tie rods
thread into the flange and the flange serves
as the rod gland retainer. Tie Rod nuts are
employed on the cap end. The rod gland
cannot be removed without loosening the
tie rods in these sizes. See chart on page
MH-10 for combinations affected.
Front Head Flange (FHF) Mount –
On the bore and rod combinations
affected, the retainer is rectangular, the
same size as the head, and the tie rods
thread into it. Tie rod nuts are employed
on the cap end. The rod gland cannot be
removed without loosening the tie rods.
See chart on page MH-10 for combinations
affected. Mounting bolts should be sized
to clear through both the head (G dim.)
and the rectangular retainer thickness
(FF dim.).
Rear Flange (RF), Rear Flange Extra
(RFX) and Rear Head Flange (RHF)
Mounts – On the bore and rod combi-
nations affected, a square retainer, the
same square size as the head, is employed.
The retainer is cleared for the tie rods,
and tie rod nuts secure it. The rod gland
cannot be removed without loosening the
tie rods. The combinations affected are
shown in the chart on page MH-12.
THREAD
BORE ROD DIA. DEPTH
1 1 / 8 5 / 8 3 / 8
5 / 8 3 / 8
1 5 / 16
2 5 / 8 , 1, 1 3 / 8 7 / 16
5 / 8 , 1, 1 3 / 8 5 / 8
1 3 / 4 7 / 16
1, 1 3 / 8 , 1 3 / 4 3 / 4
2 1 / 2
1, 1 3 / 8 , 1 3 / 4 , 2 3 / 4
2 1 / 2 11 / 16
1, 1 3 / 8 , 1 3 / 4 ,
2, 2 1 / 2 1 1 / 4
3 15 / 16
3 1 / 2
3 / 4
1 3 / 8 , 1 3 / 4 , 2,
2 1 / 2 , 3, 3 1 / 2 1 1 / 8
4 1
1 3 / 8 , 1 3 / 4 , 2,
2 1 / 2 , 3, 3 1 / 2 ,
4, 4 1 / 2 1 1 / 8
5 1
8 ALL 1 1 / 8
NOTE: Side flush mounting is available with
usable thread depths shown above.
1 1 / 2
2 1 / 2
3 1 / 4
4
5
6
7
Side Flush Note:
Thread Depth and Slide Flush
Mounting Availability Chart
1 MH-7