Disassembling The Set Of Stage Casings; Disassembling The Bearing Housing On The Suction Side; Disassembling The Ball Bearing On The Suction Side; Disassembling The Mechanical Seal On The Mchzs Suction Side - Johnson Pump MCHZ Instruction Manual

7.3.7
7.3.8
7.3.9
7.3.10
30

Disassembling the set of stage casings

1 Uncouple the balance pipe (0720) if fitted.
2 Only for MCHZS: Slacken the adjustment screw (0300) and remove the set ring
(0060).
3 Unscrew the nuts (0750) from the tie rods (0740). For MCHZ(S) 12.5 x 1-3,
MCHZ(S) 14a/b x 1-3 and MCHZ(S) 16 x 1: disassemble bolts and nuts (0770).
4 Remove the pump casing (0020) from the stage set. Using a suitable bush, press or
tap the throttling bush (0070) out of the inlet casing.
5 Remove the external circlip (0090) and any throttling sleeve (0600) from the pump
shaft.
6 Remove the end cover (0030) and the air wheel (0040). Remove the key (0730) from
the shaft.
7 Remove the pump cover (0530) and remove the external circlip (0090).
8 Remove all impellers (0520), stage casings (0510) and keys (0730).
9 Remove the suction cover (0020) from the pump casing (0500).

Disassembling the bearing housing on the suction side

1 Position the pump casing with the shaft horizontally.
2 Remove the rear bearing cover (0120).
3 Continue from step 5 of paragraph 7.3.4.

Disassembling the ball bearing on the suction side

See paragraph 7.3.5, with the exception of step 1.

Disassembling the mechanical seal on the MCHZS suction side

See paragraph 7.3.6.
Disassembly and assembly
MCHZ/EN (0912) 4.2