Out of curiosity, looked up the part at Messick's and it is $187.28, which is crazy to replace a washer pump motor. What I find interesting is that they have 15 in stock. That seems like a high quantity to have in stock unless their are a lot of pump failures.
The Tank assembly is used in 67 different models. Perhaps one of the older parts contained a pump only part number that could be used to find a Pump Only... Just a suggestion.
Here are the other models this is used on in the event it helps. At a minimum it gives more opportunities to use your favorite search engine.
Report back if you ever find one.
(Now I understand why they have so many in stock, give the plethora of models it fits.)
L3240HSTC (Hydrostatic Transmission / Cabin / 2007 - 2009)
L3430DT / GST / HST(C) (Dual Traction, 4wd / Glide Shift Transmission / Hydrostatic Transmission) - B42001 WASHER TANK [CAB TYPE] [A]
L3430DT / GST / HST(C) (Dual Traction, 4wd / Glide Shift Transmission / Hydrostatic Transmission) - B42002 WASHER TANK [CAB TYPE] [CA]
L3540HSTC (Hydrostatic Transmission / Cabin / 2007 - 2009)
L3560HSTC-LIMITED
L3710DT-HST-C - B42001 WASHER TANK [A] [CAB TYPE]
L3710DT-HST-C - B42002 WASHER TANK [CA] [CAB TYPE]
L3710DT-HST-C (Cab) - B42001 WASHER TANK [A] [CAB TYPE]
L3710DT-HST-C (Cab) - B42002 WASHER TANK [CA] [CAB TYPE]
L3940HSTC (Hydrostatic Transmission / Cabin / 2007 - 2009) - B42001 WASHER TANK [A]
L3940HSTC (Hydrostatic Transmission / Cabin / 2007 - 2009) - B42002 WASHER TANK [CA]
L4240HSTC (Hydrostatic Transmission / Cabin / 2007 - 2009) - B42001 WASHER TANK [A]
L4240HSTC (Hydrostatic Transmission / Cabin / 2007 - 2009) - B42002 WASHER TANK [CA]
L4310DT-GST-C / HST-C - B42001 WASHER TANK [A] [CAB TYPE]
L4310DT-GST-C / HST-C - B42002 WASHER TANK [CA] [CAB TYPE]
L4310DT-GST-C / HST-C (4wd, Cab) - B42001 WASHER TANK [A] [CAB TYPE]
L4310DT-GST-C / HST-C (4wd, Cab) - B42002 WASHER TANK [CA] [CAB TYPE]
L4330DT / GST / HST(C) (Dual Traction, 4wd / Glide Shift Transmission / Hydrostatic Transmission) - B42001 WASHER TANK [CAB TYPE] [A]
L4330DT / GST / HST(C) (Dual Traction, 4wd / Glide Shift Transmission / Hydrostatic Transmission) - B42002 WASHER TANK [CAB TYPE] [CA]
L4610DT-HST-C (Hydrostatic Transmission, 4wd / Cab) - B42000 WASHER TANK [A] [CAB TYPE]
L4610DT-HST-C (Hydrostatic Transmission, 4wd / Cab) - B42001 WASHER TANK [CA] [CAB TYPE]
L4630DT / GST(C) / HST (Dual Traction, 4wd / Glide Shift Transmission / Hydrostatic Transmission) - B42001 WASHER TANK [CAB TYPE] [A]
L4630DT / GST(C) / HST (Dual Traction, 4wd / Glide Shift Transmission / Hydrostatic Transmission) - B42002 WASHER TANK [CAB TYPE] [CA]
L4740HSTC (Hydrostatic Transmission / Cabin / 2007 - 2009) - B42001 WASHER TANK [A]
L4740HSTC (Hydrostatic Transmission / Cabin / 2007 - 2009) - B42002 WASHER TANK [CA]
L5030GST / HST(C) (Glide Shift Transmission / Hydrostatic Transmission) - B42001 WASHER TANK [CAB TYPE] [A]
L5030GST / HST(C) (Glide Shift Transmission / Hydrostatic Transmission) - B42002 WASHER TANK [CAB TYPE] [CA]
L5240HSTC (Hydrostatic Transmission / Cabin / 2007 - 2009)
L5740HSTC (Hydrostatic Transmission / Cabin / 2007 - 2009)
M-110DTC (Dual Traction, 4wd / Cab)
M-110FC (Two Wheel Drive / Cabin)
M-120DTC (Dual Traction, 4wd / Cab)
M-120FC (Two Wheel Drive / Cabin)
M4D-061HDC12
M4D-071HDC12
M5-111HDC12 / HDC12-1
M6-101DTC
M6-111DTC
M6-131DTC
M6-141DTC / DTSC
M6060HDC
M6060HFC
M7-131P
M7-131P KVT
M7-131PB
M7-132P
M7-132P KVT
M7-132S
M7-151P
M7-151P KVT
M7-151PB
M7-151PB KVT
M7-151S
M7-152P
M7-152P KVT
M7-152S
M7-171P
M7-171P KVT
M7-171PB
M7-171PB KVT
M7-171S
M7-172P
M7-172P KVT
M7-172S
M7060HDC12
M7580DT-C (Dual Traction, 4wd / Cab)
M8580DT-C (Dual Traction, 4wd / Cab)
M9580DT-C (Dual Traction, 4wd / Cab)
M9960HDC (Hydraulic Shuttle, 4wd / Cabin)
MX5400DTC
MX5400DTHC
MX6000DTHC
R420S
R430
R520S
No code has to be inserted here.