Clarke Focus II Mid-Size Scrubber: Manual, Specs and Poor Water Pickup

CLARKE FOCUS II MID-SIZE · US MODEL FAMILY · SOURCE CHECKED SEPTEMBER 29, 2026

Machines / Clarke Focus II Mid-Size

Quick answer: The Clarke Focus II Mid-Size is a battery-powered walk-behind floor scrubber family. Clarke’s documents cover Disc 26, 28 and 34; BOOST 28 and 32; and Cylindrical 28 configurations. The manufacturer-hosted operator manual also has a troubleshooting table for poor water pickup. Match the deck, battery package and serial label to your actual machine before using a manual or ordering components.

Which Clarke Focus II is covered here?

This page covers the Mid-Size walk-behind family, not the Focus II Compact or Focus II Rider. Nilfisk’s US listing for the Focus II BOOST28 242AH identifies product number 05371A. That product number belongs to the listed BOOST 28 configuration and must not be treated as the identifier for every Mid-Size variant.

The manufacturer’s Mid-Size brochure lists six deck choices: three disc widths (26, 28 and 34 inches), BOOST 28 and 32, and Cylindrical 28. It lists a 23-gallon solution tank and a 23-gallon recovery tank for the family, with 24-volt power from four 6-volt batteries. Brush assemblies, squeegee widths and consumables differ by deck. These are brochure specifications, not a guarantee about an individual used machine or a later revision.

Where is the official Focus II Mid-Size manual?

Open Clarke’s Focus II Mid-Size operator manual (PDF). Its cover identifies Form No. 71483A, originally 12/08, revised 10/12; the PDF includes English, Spanish and French sections plus parts drawings. The English table of contents points to machine specifications on printed page 5, maintenance on pages 21–24, and the problem table on printed page 25 (PDF page 25). The cover lists specific model numbers and is marked revised 10/12. Product number 05371A from the current US listing does not appear in that cover list, so applicability to that SKU is unverified. Compare the exact model and serial label with Clarke or an authorized dealer before relying on this manual for service.

Why does a Focus II Mid-Size leave water on the floor?

In the manual’s printed page 25 problem table, incomplete water pickup can be associated with the squeegee position, a full recovery tank, a dirty screen filter, a disconnected vacuum hose, obstruction or damage in the squeegee/hose/standpipe, worn or incorrectly fitted squeegee blades, the recovery-tank lid gasket, or a drain valve that is not closed. A vacuum motor problem is also listed; it calls for authorized service rather than an operator electrical test. This is a set of documented possibilities, not a remote diagnosis.

What can an operator check safely?

1. Stop on a level surface, turn off the machine and follow its operator manual before inspection. Mark wet floor areas to prevent slips.
2. Check whether the squeegee is lowered and whether the recovery tank is full. Empty the tank according to the manual if needed.
3. Inspect accessible squeegee blades, the hose connection, visible obstructions and the screen filter with the machine off. Note any torn gasket or open drain valve.
4. Record whether the wet trail is centered, one-sided or across the whole path; include any unusual motor sound when requesting service.

Do not remove electrical covers, bypass safety controls or test live wiring. A motor failure, damaged wiring or internal repair belongs with qualified service personnel.

What details should I record before asking for help?

• Full model marking, deck type and width: Disc, BOOST or Cylindrical.
• Serial number and battery configuration from the data plate.
• Whether the tank was full, the squeegee was lowered and the hose was connected.
• The location of the wet trail and any indicator or displayed message, quoted exactly.

Browse manual references, troubleshooting guides and machine records, or use the equipment question form to describe the symptoms. No fault code or part compatibility is inferred from these observations.

Official sources and editorial status

• Nilfisk US product listing, Focus II BOOST28 242AH, item 05371A.
• Clarke Focus II Mid-Size brochure, P/N 70506A, 1/13.
• Clarke operator manual, Form 71483A, revised 10/12, printed page 25.

Verified: model family, listed US product number, brochure tank and deck data, manual identity and documented pickup causes. Not verified: manual applicability to product 05371A, individual serial coverage, currently supplied parts and diagnosis of a particular machine. Sources checked September 29, 2026. CleanEquip Pro is an independent information site and is not affiliated with Clarke or Nilfisk.