CH&E 5400-6400 2″ Diaphragm Pump Repair Parts

The CH&E 5400-6400 2 inch diaphragm pump is a heavy-duty built for hydraulic motor powered and close-coupled configurations across construction, mining, industrial, and municipal applications. The 5400 series uses an aluminum housing for lightweight portability, while the 6400 series uses cast iron construction for superior durability in abrasive and high-wear environments.

Both series share a large proportion of internal components, which simplifies parts sourcing and servicing. Wetted-end components such as the suction connection, water box, diaphragm bottom, and discharge connection differ between aluminum and cast iron variants, so always confirm your series before ordering these parts.

Models covered on this page include:

• 5401, 5402, 5403, 5405 (5400 Series Aluminum)
• 6401, 6402, 6403, 6405 (6400 Series Cast Iron)
• Extended models: 5433, 5435, 5436, 5437, 5438, 5439, 5452, 5453, 5457, 5458 and cast iron equivalents

Key Features of the CH&E 5400-6400 2″ Diaphragm Pump

• 2 inch inlet and outlet ports for efficient fluid transfer
• Diaphragm-driven design with self-priming capability
• Handles solids-laden fluids, slurries, and abrasive materials
• Dry-run safe operation without damage to internal components
• Available in aluminum (5400 Series) and cast iron (6400 Series) housing
• Hydraulic motor powered and close-coupled configurations available
• Wheel mounting and skid mounting options for flexible deployment
• Low maintenance design engineered to reduce operational downtime

Industries and Applications

The CH&E 5400-6400 2 inch diaphragm pump is used across a wide range of industries where reliable fluid transfer and solids-handling capability are required. Keeping this pump in service with the right repair parts protects productivity across every application.

• Construction and Dewatering: Removes water from excavations, trenches, and foundations efficiently with the 2″ port configuration
• Agriculture and Irrigation: Transfers water from open sources, tanks, and ponds for irrigation and livestock operations
• Mining and Quarrying: Handles abrasive slurries and mine drainage in cast iron 6400 series configurations built for high-wear environments
• Industrial Fluid Transfer: Moves process fluids, chemicals, and waste water in manufacturing and utility maintenance settings
• Municipal Operations: Used for bypass pumping, sewer maintenance, and emergency water removal by utility crews

Exploded Parts

5400 vs. 6400 Series: Aluminum vs. Cast Iron 2 Inch Diaphragm Pump

Both the 5400 and 6400 series use the same 2 inch diaphragm pump design and share the majority of internal drivetrain components. The housing material is the primary difference and determines which applications each series is best suited for.

CH&E 5400-6400 2 Inch Diaphragm Pump Repair Parts

CH&E 5400-6400 Wheel Mounting Repair Parts

CH&E 5400-6400 Skid Mounting Repair Parts

Flap Valve Assemblies for CH&E 5400-6400 2 Inch Diaphragm Pumps

Each CH&E 5400 and 6400 series 2″ diaphragm pump requires two flap valve assemblies. The correct material choice depends on the fluid being pumped and the conditions in which the pump operates. The options below cover the full range of available materials for the CH&E 5400-6400 2 inch diaphragm pump repair parts lineup.

• SA-10003B – Buna-N: General-purpose use with water, petroleum-based fluids, and mild chemicals
• SA-10003N – Neoprene: All-weather outdoor performance with good resistance to oils and moderate chemical exposure
• SA-10003V – Viton: High-chemical-resistance option for aggressive solvents, fuels, and elevated temperature applications
• SA-10004N – Neoprene with Cloth Insert: Recommended for abrasive slurries, sandy water, and high-cycle applications where extended valve life is a priority

Which Flap Valve Material Is Right for My Application?

For standard construction dewatering and general water transfer, Neoprene (SA-10003N) is the most versatile choice. When pumping abrasive slurries or debris-laden water, the cloth-insert Neoprene valve (SA-10004N) delivers longer service life between replacements. Viton (SA-10003V) is the right option when chemical compatibility is critical, such as in industrial fluid transfer or chemical processing environments. Buna-N (SA-10003B) suits applications involving light fuel or petroleum contact.

Diaphragm Pump Rebuild Kits for CH&E 5400-6400 2 Inch Diaphragm Pumps

Kendisco stocks complete rebuild kits for the CH&E 5400 and 6400 series 2 inch diaphragm pump. Each kit includes the #2E diaphragm, flapper valve assemblies, and all necessary hardware for a full fluid-end rebuild. Replacing all wear components at once reduces the likelihood of a secondary failure shortly after service and restores your pump to original performance levels.

• W103-020.0T – TPE: Excellent chemical resistance and flexibility across a wide temperature range, ideal for demanding industrial applications
• W103-020.0R – Rubber: Cost-effective general-purpose option for standard water transfer and dewatering
• W103-020.0N – Neoprene: Durable all-weather performance with good resistance to oils and moderate chemicals
• W103-020.0B – Buna-N: Best suited for applications involving petroleum-based fluids and light chemical contact
• W103-020.0V – Viton: Highest chemical resistance available, recommended for aggressive chemical transfer and high-temperature environments

Maintenance and Service Guidance

Regular inspection and timely replacement of wear parts keeps the CH&E 5400-6400 2 inch diaphragm pump performing reliably across extended service cycles. Focus your routine maintenance on the following areas:

• Inspect the diaphragm and flap valve assemblies after every 250 hours of operation or whenever output pressure drops noticeably
• Check the connecting rod bearing and grease fitting at each scheduled service interval
• Inspect lip seals around the gear case for any signs of leakage
• Verify the correct pinion is installed for your specific pump model using the selection table above
• Confirm all fasteners are correctly torqued after any disassembly or component replacement
• Flush the pump with clean water after handling abrasive, chemical, or solids-laden fluids
• Store the pump with the diaphragm in a relaxed position to extend its service life between jobs

Kendisco carries the full range of genuine CH&E 5400-6400 repair parts and rebuild kits. Contact Ken’s Distributing Company for part availability, current pricing, and technical assistance.

Frequently Asked Questions

What models are covered by the CH&E 5400-6400 repair parts breakdown?

This parts reference covers the 5401, 5402, 5403, 5405, 6401, 6402, 6403, and 6405 models in the CH&E 5400-6400 Series 2 inch diaphragm pump lineup, including hydraulic motor powered, close-coupled, wheel mounting, and skid mounting configurations.

Are the internal components shared between the 5400 and 6400 Series?

Yes. The core mechanical and drivetrain components, including the connecting rod, bearings, gears, seals, diaphragm, and flap valve assemblies, are shared across both series. Wetted-end parts such as the suction connection, discharge connection, water box, and diaphragm bottom are series-specific due to the difference in housing material between aluminum and cast iron.

How do I select the correct pinion for reference number 45?

The correct pinion depends on your specific pump model. Models 5401-6401 and 5402-6402 use part P4854 with a 3/4 inch bore and 3/16 inch keyway. Models 5403-6403 use P4855 with a 5/8 inch bore and 3/16 inch keyway. Models 5405-6405 use P4855A with a 5/8 inch bore and 5/32 inch keyway. The pinion selection table above provides a quick reference for all models.

How many flap valve assemblies does the CH&E 5400-6400 pump require?

Each pump requires two flap valve assemblies. Four material options are available: Buna-N, Neoprene, Viton, and Neoprene with Cloth Insert. Select the material based on the fluid being pumped and your operating environment.

What rebuild kit materials are available for the CH&E 5400-6400 Series?

Five rebuild kit options are available: TPE, Rubber, Neoprene, Buna-N, and Viton. Each kit includes the diaphragm and flapper assemblies along with all required hardware for a complete pump rebuild. The 5400-6400 Series offers one additional material option compared to the 5500-6500 Series, with Viton available for chemically demanding applications.

What is the difference between the CH&E 5400-6400 and the 5500-6500 Series?

The 5400-6400 Series is a 2 inch diaphragm pump, while the 5500-6500 Series is a 3 inch diaphragm pump. The larger 3 inch ports on the 5500-6500 Series deliver higher flow volumes for applications requiring greater throughput. Both series share the same gear case components and similar drivetrain architecture, but the wetted-end and pump-specific parts differ between the two size families.

Where can I buy genuine CH&E 5400-6400 repair parts?

Ken’s Distributing Company stocks genuine CH&E 5400-6400 repair parts and rebuild kits for the complete series. Contact Kendisco directly for part availability, pricing, and technical support.

Related CH&E Diaphragm Pump Parts

• CH&E 5500-6500 3″ Diaphragm Pump Parts Breakdown
• CH&E 5500 Series Aluminum 3″ Diaphragm Pump Repair Parts
• CH&E 6500 Series Cast Iron 3″ Diaphragm Pump Repair Parts
• CH&E 5400 Series Aluminum 2″ Diaphragm Pump Repair Parts
• CH&E 6400 Cast Iron 2″ Diaphragm Pump Repair Parts