Drum Inlet Injector

The drum must be connected to the washer pump so that water can flow under pressure through the hose wound onto it. Inlet injector 40169 is the component that realises this connection on the inlet side – it connects the pump installation to the drum hydraulic circuit at the point where water enters the drum system.

Application

The injector is mounted on the inlet side of the hose reel drum and forms the connection point between the drum hose and the Kranzle washer pump. It routes water under working pressure from the pump installation into the drum hydraulic circuit. It cooperates with the drum swivel connector – the injector on the inlet side and the swivel connector on the lateral side of the drum together form the complete hydraulic circuit that enables the drum to rotate freely without interrupting water flow.

Symptoms – When to Replace

• Leakage at the drum hose-to-pump connection point – water seepage under normal operating pressure.
• Damaged thread or connector on the pump connection side – difficulty seating or removing the injector securely.
• Cracked injector body after mechanical impact or overloading during installation.
• Restricted flow through the drum with a functional pump and clear hose – blockage in the injector internal channel.

How to Select the Correct Part

The basis for selection is reference number 40169. The injector must fit geometrically with the drum inlet seat and with the connection on the pump side – both connections must be compatible. When replacing, compare the new component with the removed one in terms of connection geometry and length. If leakage appears in the drum inlet area, also assess the condition of the seat in the drum itself before ordering – a damaged seat requires separate repair regardless of the injector replacement.

Compatibility

Kranzle catalogue part. Used among others in hose reel drums of Kranzle pressure washers with an inlet connection to the pump. Cooperates in the drum hydraulic system with swivel connector 40167 and swivel connector spindle 40168. Verify compatibility with a specific drum model using reference number 40169 or the drum service diagram.

[faq]

What is the difference between the inlet injector and the swivel connector in the drum hydraulic system?|Inlet injector 40169 is a static component on the pump side – it connects the pump installation to the drum inlet and does not rotate during operation. Swivel connector 40167 together with spindle 40168 is the joint on the lateral side of the drum that enables drum rotation while maintaining a seal. Both components cooperate within the same hydraulic circuit but perform different functions.

Does leakage at the drum inlet always result from injector damage?|Not always. Leakage in this area can originate from a damaged seat in the drum itself, a worn seal between the injector and the seat, or a damaged connection on the pump hose side. Before replacing the injector, locate the exact leak point – with the injector fitted and under working pressure, check whether water appears at the thread, at the hose connection, or at the contact between the injector and the drum housing.

Can injector blockage cause a pressure drop when working through the drum?|Yes. Mineral deposits or mechanical contaminants can partially block the injector internal channel and restrict flow. The result is lower pressure or output when working through the drum, while full parameters are maintained when the hose is connected directly to the pump. Before replacing the injector, check the internal channel for clear flow after disassembly.

What should be checked first if the leak does not stop after replacing the injector?|Check in sequence: the condition of the seat in the drum housing, correct seal seating, injector tightening, and the condition of the hose connection on the pump side. If the leak appears at the thread rather than at the face contact, check the type of seal used. If the seat in the drum is worn or damaged, the injector will not seal reliably regardless of the tightening torque applied. 

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