Crane DEMING 4121 Series User Manual

A Crane Co. Company
IMPORTANT! Read all instructions in this manual before operating pump.
As a result of Crane Pumps & Systems, Inc., constant product improvement program,
product changes may occur. As such Crane Pumps & Systems reserves the right to
change product without prior written notifi cation.
420 Third Street 83 West Drive, Bramton
Piqua, Ohio 45356 Ontario, Canada L6T 2J6
Phone: (937) 778-8947 Phone: (905) 457-6223
Fax: (937) 773-7157 Fax: (905) 457-2650
www.cranepumps.com
Form No. 120004-Rev. G
Series: 4111, 4121
4121H
DEMING
DEMING
®
INSTALLATION, OPERATION & MAINTENANCE MANUAL
End-suction Centrifugal Pumps
DISCONTINUED
Parts may
NOT be available
Manual Index

Crane DEMING 4121 Series Specifications

General

Brand	Crane
Model	DEMING 4121 Series
Category	Water Pump
Language	English

Summary

Safety First

General Safety Precautions

Covers essential safety measures including hazard symbols, personal protective equipment, and proper handling procedures.

Electrical Safety

Details critical electrical safety practices such as grounding, power disconnection, and wiring compliance.

Operational Safety

General Information and Preparation

Shaft Alignment

Provides detailed steps for aligning pump and motor shafts using a straight edge and thickness gauge.

General Maintenance and Repair

Impeller and Stuffing Box Adjustment

Liquid End Inspection and Repair

Ball Bearing Inspection and Replacement

Stuffing Box Repacking

Mechanical Seal Replacement

Gives detailed instructions for removing and installing single and double mechanical seals.

Troubleshooting

No Liquid Delivered

Lists common causes for a pump delivering no liquid, such as rotation or priming issues.

Insufficient Liquid Delivery

Identifies reasons for insufficient liquid delivery, including discharge head and suction lift problems.

Low Pressure Issues

Intermittent Operation

Excessive Power Consumption