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Control Piston for Junior
43071
1.2 x 6.7 x 1.2 cm
0.02 kg
Authorised distributor
€16.87
Ostatnie sztuki!
The control piston (Steuerkolben) is the moving element of the control valve, i.e. the unloader in the pump valve housing. Original Kränzle number: 43071. In the Junior 120 parts catalog it is item 12 in the valve housing assembly (Ventilgehäuse). It is sold as the piston alone, without the spring, guide and seals.
Application
The piston works in the valve housing of the Kränzle Junior pump and controls its switching after the gun is closed. The same assembly contains: the piston guide (43072), the M 6 spring pressure nut (43073), the unloader spring (43074), the Parbaks for the 6 mm stem (14.123 2) and the 8.5 x 2 O-ring (43070). When the piston is worn, these parts usually work together with it, so it's worth assessing the whole assembly before ordering.
Symptoms – when to replace
- Pressure at the lance jumps or pulsates, even though the nozzle, filter and water supply are fine.
- After the gun is closed, the pump doesn't unload properly or the system pressure drops with a delay.
- The piston sticks in the guide or returns to position with resistance.
- Scratches, seizing or pitting from water deposits are visible on the piston surface.
- Water leaks from the valve housing around the stem, and replacing the Parbaks and O-rings didn't help.
How to choose the right part
- By number: 43071. This is the piston alone. The set with seals, guide and spring has number 43097 (Steuerkolben komplett).
- By model: Junior 120. For the 43097 set, sellers list Junior 120 and Junior 140; for the piston 43071 alone, we have confirmation in the Junior 120 parts catalog.
- By the removed piston: compare the length, the shape of the ends and the stem diameter. If the piston is scratched, replace it together with the guide and seals.
- Don't confuse with control pistons from other Kränzle pumps (e.g. 44532 for AZ pumps, 14.134 or 40490 for AM pumps). These are different parts, not substitutes.
Compatibility
Fits Kränzle Junior 120 pressure washers (item 12 in the parts catalog, valve housing). For the Junior 140, sellers list the 43097 set, which contains this piston, but a separate parts list for the 140 model wasn't available, so it's worth confirming that number 43071 itself fits this model before ordering. Does not fit AZ, AM pumps or other Kränzle series.
[faq]
How does 43071 differ from 43097?|43071 is the control piston alone. 43097 is a set that includes, among other things, an O-ring, Parbaks, piston guide, pressure nut and unloader spring. If wear shows only on the piston, 43071 is enough. When the valve is heavily worn, the set is often more convenient.
I replaced the piston but the pressure still jumps. What should I check next?|The piston guide (43072), the unloader spring (43074) and the seals in the valve housing. A worn guide or a weakened spring gives the same symptom as a damaged piston. Also check the pump valves and the nozzle, since pressure spikes can have another cause.
Does a piston from pressure washers with an AZ or AM pump fit the Junior?|No. These pumps have their own control pistons under different numbers (e.g. 44532, 14.134, 40490). Order strictly by the number from the Junior model's parts list.
I'm replacing the Parbaks on the stem. Does the piston need replacing too?|Not always. If the piston surface is smooth and the piston moves freely in the guide, replacing the seals is enough. Replacing the piston makes sense with scratches, seizing or noticeable resistance.
[/faq]
Technical data
Model
Junior 140
Model
Junior 120
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