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FIG. 34 – REMOVING FIRST STAGE IMPELLER
LABYRINTH SEAL
Current production compressors lo-
cate the exit plates with roll pins. Some
older machines locate the exit diffus-
ers within a circle of machined hex
head cap screws. DISTURBING
THESE SCREWS WILL MISALIGN
THE DIFFUSER EXIT PLATES.
Don't rotate the cap screws retaining
the exit vanes.
B. You may be able to handle the 26" exit plates
without rigging, but the 38" and 55" are too
heavy and may not be safe. Continue remov-
ing successive stages until the first stage en-
trance diffuser is exposed.
5. The first stage vane entrance diffuser disk (180)
and impeller labyrinth seal are solid pieces – not
split in half. Before the first stage impeller laby-
rinth seal (156) can be removed the following
should be performed:
YORK INTERNATIONAL
LD07350
FIG. 35 – ROTOR
A. Remove the oil reservoir (See Removing Oil
Reservoir, paragraph 5). Use blocks to support
the rotor assembly.
B. Carefully place a rope sling around the rotor
assembly (shaft and impellers). Be sure to
watch the balance while rigging. With a chain
hoist lift out the rotor assembly carefully mov-
ing the rotor toward the oil reservoir end until
the drive end of the shaft is clear of the PRV
assembly, then lift out of casing (see Fig. 35).
6. Remove the first stage labyrinth seal (retaining ring
and seal ring) as shown in Fig. 34. This retaining
ring (155) has tapered ends and can be removed
with a screw driver.
7. Normally, it will not be necessary to remove the
first stage diffuser disk. If it becomes necessary to
remove this plate, the pre-rotation vane assembly
must first be removed as outlined under Removing
the Pre-rotation Vane Assembly.
FORM 220.11-NM2 (602)
4
LD07351
59
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