ASAB DDP42 Replacement Parts #36 - Sequential Cover

Part Code: ASAB-SDDP42-36

Introducing the ASAB DDP42 Sequential Cover — a dedicated cover component designed to protect and retain the sequential (air valve/shift) section on ASAB DDP42 double diaphragm pumps. This cover helps keep the air-end internals sealed up, aligned, and protected from job-site dust, overspray, and impact — supporting consistent shifting and reliable cycling under load.

A damaged, warped, or cracked sequential cover can lead to headaches like air leaks, poor shifting, erratic cycling, or contamination getting into the air valve area, which then snowballs into stalling and inconsistent performance. Replacing the cover is the right move when sealing faces won’t clean up, threads are damaged, or the pump has been knocked around and won’t stay tight after servicing.

Whether you’re doing a full air-end rebuild, fixing persistent air leaks, or restoring a pump that’s started hunting/stalling, the ASAB-SDDP42-36 is a workshop-ready solution to keep your DDP42 air-end protected and operating properly.

Key Benefits

• Direct replacement sequential cover for ASAB DDP42

• Protects air-end internals from dust, overspray, and impact

• Supports proper retention and alignment of sequential/air valve components

• Helps prevent air leaks caused by warped or damaged cover sealing faces

• Can resolve issues linked to contamination and poor sealing: erratic cycling, stalling, hunting

• Ideal for air-end rebuilds and major services

• Built for commercial workshop and job-site use

What’s Included

• DDP42 Sequential Cover — ASAB-SDDP42-36

Safety Check

• Isolate and depressurise first: Shut off air supply, bleed the airline fully, and confirm the pump is not pressurised before disassembly.

• Keep the air end clean: Dirt on sealing faces or inside the valve area can cause immediate shifting issues—work clean and lint-free.

• Inspect mating parts: Check valve plate, seals, spool/slider, and housing faces—don’t bolt worn parts onto a new cover and expect miracles.

• Even tightening: Tighten fasteners in a cross pattern to avoid distorting the cover and creating leak paths.

• Check for leaks safely: Repressurise slowly and use soapy water—don’t use your hands to find leaks on a live airline.

• Test gradually: Bring air pressure up slowly, confirm smooth cycling and no air leaks, then return to operating conditions.

ASAB – Engineered for Performance, Built to Last.