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COUPLING ALIGNMENT – FOOTED
GEARBOX
The following pertains to units with non-standard, footed
gearboxes only. Standard GNX(H) units will not require
manual alignment.
The pump must be directly coupled to a gear and/or driver
with a flexible coupling. Verify coupling alignment after
installation of new or rebuilt pumps. Both angular and
parallel coupling alignment MUST be maintained between
the pump, gear, motor, etc. in accordance with
manufacturer’s instructions. See Figure 3.
1. Parallel alignment: The use of a laser alignment tool or
dial indicator is preferred. If a laser alignment tool or dial
indicator is not available, use a straightedge. Turn both
shafts by hand, checking the reading through one
complete revolution. Maximum offset should be less
than .005" (.127 mm).
2. Angular alignment: Insert a feeler gauge between the
coupling halves. Check the spacing at 90° increments
around the coupling (four checkpoints). Maximum
variation should not exceed .005" (.127 mm). Some
laser alignment tools will check angular alignment as
well.
3. Replace the coupling guards after setting alignment.
Figure 3 – Alignment Check
Operation without guards in place can
cause serious personal injury, major
property damage, or death.
Do not operate
without guard
in place
ALIGNMENT – GNX(H) MODELS
The motor, gearbox, and pump are rigidly connected with
bolted, flange connections. These flanges ensure the motor
shaft, gearbox shafts, and pump shaft are aligned correctly,
without the need for manual alignment. However, due to
variations in base and foundation geometry the unit will
require shimming to reduce stress on the gearbox and pump
adapter. See
PRESTART CHECKLIST
section for details.
NEMA MOTOR COUPLING ADAPTER
Failure to disconnect and lockout
electrical power or engine drive before
attempting maintenance can cause
severe personal injury or death
Hazardous
machinery can
cause serious
personal injury.
Motor adapters allow for easy installation and removal of
industry standard motors. Motor adapters consist of a
coupling and an adapter housing that connects the motor to
the gear reducer.
NORD Gear supplies a coupling that is to be mounted on the
motor shaft. It is important that the coupling is properly
positioned.
• For NEMA Input Adapters, follow the Motor Installation
Instructions on page 5.
• For IEC Input Adapters, the supplied coupling will mount
directly against the motor shaft shoulder. No locating
measurements need to be taken.
Couplings
Couplings are made with tough abrasion resistant materials,
which resist most chemicals and petroleum products. They
are electrically isolated (prevent metal to metal contact) and
require no lubrication or maintenance. Depending upon the
size of the C-face input, NORD provides either a gear or a
jaw type coupling.
NORD supplies three different types of couplings depending
on the size of input: “J” style, “M” style and “Jaw” style
coupling.
Following are instructions on how to properly mount each
type of coupling onto the motor.
BoWex® Couplings
NORD C-face adapter input shafts have a machined spline
on the end. NORD incorporates two styles of BoWex®
couplings, the “J” and “M” styles. The “J” style is a one-piece
coupling with a metal hub and nylon spline. The “M” style is a
two-piece coupling – the metal hub and a nylon sleeve. Nylon
and steel components allow them to operate in high ambient
temperatures without lubrication or maintenance.
• Nylon sleeves resist dirt, moisture, most chemicals and
petroleum products
• No lubrication required
• Operating Conditions: -22ºF - 212ºF (-30ºC - 100ºC)
• Higher temperature coupling sleeve available up to 250ºF
(120ºC)
• Special bore available
NEMA Motor Coupling Styles
