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4.4.3 Disassembly / Assembly - Mechanical Seal
Instructions
Cautionary Notes
REMOVAL
1
Remove drive coupling “spider”.
2
Remove coupling hub from compressor
by firstly removing the flange from the
hub then sliding the hub off the shaft. The
flange will probably need to be jacked off
using jacking screw holes provided on the
flange. Once the flange is removed, the
hub will need to be spread a little using a
screwdriver to allow the hub to be slid off
easily.
Before removing the flange, check
the distance between the hub on the
motor and the hub on the
compressor. The distance should be
117.0mm + or – 0.15mm. After
installing the new mechanical seal
and refitting the coupling hub to the
shaft, the distance between the hubs
should equal this distance (see
coupling hub drawing attached).
3 Remove
key
from
shaft.
4
It is important to protect mechanical seal
faces from damage while removing /
installing. Heavy paper or thin card must
be wrapped around crankshaft before
mechanical seal gland housing (CR-3286)
is removed.
Slide card onto crankshaft through
lip seal cavity up to crankshaft
shoulder.
5
Rotate compressor crankshaft until drive
keyway is at the top.
This ensures that the mechanical
seal drive pin is at the top and
cannot fall out when Spring
Assembly is removed.
6
Remove mechanical seal gland housing
from drive end bearing housing.
7
Remove dynamic part of seal (Silicon
Carbide Ring) along with Spring
Assembly.
To do this, 2 “wire pullers” should
be hooked behind Spring Assembly
180 deg apart. The Spring
Assembly / Silicon Carbide Ring
can then be removed as an
assembly. Ensure that protective
card is wrapped around crankshaft
while removing this assembly.
8
Check condition of drive pin (CR-3259)
Drive pin can be removed using
pliers. Take care when doing this.
The pin can drop out and fall into
the cavity at the bottom of the
mechanical seal housing.
9
Clean out drive end bearing housing
where mechanical seal is located.
INSTALLATION
1 Slide
spring assembly onto the shaft
Intermech Ltd. BBR-6015-2 Compressor Service Manual
