Rexnord Falk A Series Assembly & Installation

Introduction

This manual covers instructions for converting Model A, B, C
or K, 1000 series YF and 2000 series Y and YB drives with
standard or optional grease purged seals to the improved
magnum seal design (Model L). These instructions also apply
to the previous mentioned drives with features such as lowered
foundation (YN, YBN) and extra capacity bearings (YT, YBT).
Earlier series Y and YB drives and Sizes 2110-2145Y1, Model
A drives cannot be converted.
Sizes 2050-2135 (Model L)
Sizes 1080-1195 & 2140-2195 (Model L)
Figure 1 — Typical Magnum Seal Assembly

Required Modifications

The Magnum seal system consists of an inner seal cage with a
throttling bush seal. An effective seal is created by the
minimum clearances between the cage lip-shaft and the cage
lip-inner bearing race. In the event that oil would get beyond
the bush seal, drainback holes in the cage and housing route
the oil back into the drive.
A further feature of the Magnum seal is the use of a grease
purgeable contaminant seal cover on Sizes 2050-2135Y & YB
and a grease purgeable split cage on Sizes 2140-2195Y & YB
and 1080-1195YF. This outer cover/cage when filled with
grease, traps airborne debris before it can enter the inner
bush seal and the drive. A lip type seal prevents the grease
and contaminants from entering. Contaminated grease can be
purged by introducing fresh grease through the grease fitting.
Contaminated grease will be forced out along the shaft.
The complete Magnum seal system consisting of bush seal,
drainback and grease-purge feature can be incorporated into
all Type Y and YF high speed shafts. Most Type Y, YF & YB low
speed shafts can utilize the complete Magnum seal design
except those with high oil levels. Refer to the Factory to
determine which drives have high oil levels. Type YB high
Rexnord Industries, LLC, Gear Group
3001 W. Canal St., Milwaukee, WI 53208-4200 USA Telephone: 414-342-3131
Fax: 414-937-4359 e-mail: info@rexnord.com web: www.rexnord.com
Falk™Gear Drives • Magnum Seal Assembly Installation
All Sizes • Types Y & YB
speed shafts cannot be provided with the bush seal or
drainback but can use the grease-purge cover or cage
feature.
The usable shaft length is reduced when this seal assembly is
used.
When ordering parts or requesting information, specify the
M.O. number, drive size, model number, rpm, ratio and date
stamped on the reducer nameplate. Also specify whether high
or low speed shaft Magnum seal assemblies are required.
Include quantity required.
Parts required in the Magnum seal assembly for retrofitting are
as follows-
— Inner Seal Cage
— Grease Purge Cover/Cage with Lip Seal and Fasteners
— Shim-Gasket Kit
Parts no longer required are as follows-
— Standard Seal Cage and Seal (do not discard fasteners)
— Baffle Ring and Fasteners
— Old Split Seal Cage with Seal and Fasteners
(when applicable)

General Instructions

CAUTION: Lock out power source and remove all external
loads from drive before servicing drives or accessories.
Consult applicable local and national safety codes for proper
guarding of rotating members.
1. PRE-DISASSEMBLY — To prevent dirt from falling into the
drive, clean all external surfaces of reducer before
disassembly. Record mounting dimensions of couplings and
accessories for reference when reassembling. If it is necessary
to remove the reducer from its operating area, disconnect all
connected equipment and lift reducer from its foundation by
means of the four lifting holes.

Drainback

Drainbacks are not required on Type YB high speed shafts or
Type Y, YF and YB low speed shafts with high oil levels.
Determine if a low speed shaft drainback is required by
examining the new inner seal cage. If through holes are drilled
in the bottom of the cage as shown at right, a drainback is
required.
2. INTERNAL DRAINBACK — Remove reducer cover and
rotating elements per the instructions in the following manuals
Type Y — Manual 148-110.
Type YF — Manual 148-210.
Type YB — Manual 248-110.
(Page 1 of 5)
148-140
June 1994
Supersedes 5-90