Complete Pump Head for Quadro

The complete head for Quadro 800/1000/1200 TST is a key component of the pump’s hydraulic section in Kränzle Quadro-series pressure washers. In service, it is replaced when wear or damage to the body affects sealing, valve-seat operation, and stability of working parameters, and replacing seals alone does not solve the problem.

MPN / reference: 405038

APPLICATION

The complete head is used in typical pump service work:

• repair of the hydraulic section in Quadro 800/1000/1200 TST units,
• pump overhaul when working surfaces and seats are worn,
• eliminating recurring sealing problems caused by body damage,
• refurbishment of machines used intensively in workshop and industrial environments.

SYMPTOMS - WHEN IT’S WORTH REPLACING

Head replacement is most often considered when there are:

• recurring leaks despite seal replacement,
• leaks in the head area or signs of water wicking at joints,
• unstable pressure related to worn seats or working surfaces,
• mechanical damage to the body (cracks, pitting, deformation),
• issues after overheating or operation in harsh conditions (deposits, corrosion, material loss).

HOW TO CHOOSE THE RIGHT PART

Selection of a complete pump head should be unambiguous:

• confirm it is intended for Quadro 800 / Quadro 1000 / Quadro 1200 TST,
• verify the manufacturer number: MPN 405038,
• compare with the removed part (body geometry, mounting points, channels, seats) and base selection on service documentation.

For pump heads, fit and geometry are critical - an incorrect selection typically leads to installation problems or lack of sealing.

COMPATIBILITY

The head is described as intended for Quadro 800, 1000 and 1200 TST. Compatibility should be confirmed by MPN 405038 and the parts list for the specific machine variant, as there may be production differences within the series.

[faq]

Is replacing the complete head a “last-step” repair?|Often yes. The head is usually replaced when seals, valves, or other wear parts don’t fix the issue because the root cause is in the body or the seats.

What head damage is typically not worth “saving” with seals alone?|Cracks, deep pitting, worn valve seats, and damaged sealing surfaces. In such cases, new seals don’t have a stable base to work against.

Can symptoms of a worn head resemble faulty pump valves?|Yes. Unstable pressure and difficulty maintaining parameters can result from valves or from worn seats in the head. That’s why replacement should follow inspection after disassembly.

What should be checked before installing a new head to avoid damaging it immediately?|Condition of pistons/plungers, valves, cleanliness of channels, water filtration, and overall condition of mating components. A worn mating part can quickly damage new working surfaces.

How can I verify after installation that the repair was successful?|After start-up, check for leaks, pressure stability under load, and no unwanted parameter drift during operation. In service, a short test cycle and follow-up inspection are commonly performed.

[/faq]