Timneh1952
Well-Known Member
I have the uh123
I guess I am a bit confused by the item numbers on the diagram. Item 23 the QTY is 2, while item 23A the QTY is 1 (machine has 2 variable displacement pumps, seems like QTY for item 23A should be 2). Is that saying the 4089122 pump is a replacement for the 4100781 pump? Then item 23B is not even a pump but some kind of internal valve?Key 23A part # 4089122 is broken down at AVspares.
https://avspare.com/catalog/hitachi/156:uh123/ab1fb6de-aa09-4b12-a6f9-3a726a51ccaf/ .
Ah, I get it now, thanks!Key 23 part # 4100781 is the number for the complete pump.
Key 23A Part # 4089122 is the number for the pump without the regulator.
Key 23B Part # 4100781 is the pump regulator.