Hoshizaki Ice Machine Water Pump Replacement: How to Match the Right Part Number to Your Model

Hoshizaki PA0613 pump motor assembly · November 7, 2026

What the water pump does on a Hoshizaki modular cuber

On Hoshizaki KM-series modular crescent cubers, the pump-motor assembly is the heart of the water circuit. During the freeze cycle, the pump motor (often labeled PM in factory wiring diagrams) circulates water from the water tank up through spray tubes and spray guides so it sheets across the evaporator plate and forms ice. In harvest, the same pump can run during harvest pump time to help release cubes. A separate pump-out cycle briefly reverses the pump to push water through the check valve and down the drain, which also power-flushes the float switch port.

If the pump weakens or quits, spray collapses, freeze times stretch, and you see freeze-up alarms long before you think about a motor failure. The inlet water valve refills the tank; the float switch decides when the machine leaves fill and when freeze ends. A bad pump mimics low water, a stuck float, or a leaking inlet valve—so confirming pump behavior matters before you buy parts.

PA0613 is one assembly—not every Hoshizaki pump

Third-party listings often market PA0613 as a universal Hoshizaki ice machine pump. Manufacturer parts lists paint a narrower picture. For example, the KM-515M_H and KM-650M_H water-circuit sections both call out Pump Motor Assembly material PA0613 with Hoshizaki part number 3A2638A03. That assembly includes the pump motor, mechanical seal, impeller (part numbers such as 433522-01 on those models), pump flange, pump housing, and related hardware—not a bare motor in a box.

Other production families use different kits:

KM-901M_H50: assembly material HS-0177, part 3A2638A02, with a different impeller and pump housing than the PA0613 family.
KM-1340MAH/MWH/MRH: assembly material S-0731, part 215693A01, motor 2U0106-01, and a 10MFD pump capacitor—not the 5.5MFD spec on mid-size M_H boards.
KM-520MAJ-E / KM-660MAJ-E: assembly material SP-5423, part 3A9779A02.

Treat model name, material number (PA0613, HS-0177, S-0731, SP-5423), and the printed 3Axxxx part number as a set. Matching one token while the others differ is how wrong pumps land on the truck.

Pull model, serial auxiliary code, and the water-circuit BOM

Hoshizaki parts manuals are organized by exact model designation—KM-515MAH, KM-650MRH, KM-901MAJ, and so on—not by a loose “KM-500 series” label. The rating plate carries model and serial. The auxiliary code is the first two characters of the serial; Hoshizaki uses it to show when a material or model number changed mid-year inside the same model name.

Your verification workflow:

Download the parts list PDF for your exact model from Hoshizaki America’s manual library.
Open section B. Water Circuit and locate Pump Motor Assembly.
Note the Material or Model Number column (PA0613, HS-0177, etc.) and the Part Number column (3A2638A03, 3A2638A02, 215693A01, 3A9779A02, …).
Check whether your serial’s auxiliary code sits in a column where that row’s part number changes.

Hoshizaki also warns that most assemblies are not sold as one shippable unit—you may need line items (impeller, seal, housing) if you are rebuilding instead of swapping the full pump-motor assembly. For controlled cleaning and inspection, the service manual’s WASH position on the control switch energizes only the pump motor so cleaner can flow over the evaporator with the cleaning valve managed correctly.

Electrical mates: pump capacitor and control-board outputs

Replacing the pump without the right pump motor capacitor is a common comeback call. On KM-515M_H and KM-650M_H control-box drawings, the pump capacitor is 5.5MFD, 250VAC (part 443192-03 in those manuals). KM-520MAJ-E / KM-660MAJ-E use the same 5.5MFD rating but list 4A6435-03 on newer boards. KM-1340M_H calls for 10MFD, 250VAC (443192-01). Capacitor microfarad rating is not interchangeable across those families.

Large modular J-series service literature describes pump motor power switching between control-board outputs during harvest versus freeze, plus timed pump-out rotation. After any pump change, qualified techs typically verify the pump runs in normal rotation during freeze, assists near the end of harvest when S4 dip switch 7 is in the factory ON position, and reverses briefly on pump-out. The diagnostic tables also list pump motor checks: winding continuity, locked rotor or worn bearings, and capacitor failure. Hoshizaki’s component service notes say to install a new capacitor whenever the pump motor is replaced—budget the capacitor even when you buy a marketed “complete” assembly.

Symptoms that point to the pump versus the rest of the water system

Before you spend on a replacement pump-motor assembly, rule out cheaper water-circuit faults:

Thin or missing spray over the evaporator while the compressor is in freeze, but the water tank is full, often tracks to pump motor, impeller, or seal failure—not an empty tank.
Water flowing from the inlet valve during freeze (instead of from the pump) shows up in service diagnosis as a leaking inlet water valve; the fix is a valve, not PA0613.
Short freeze cycles with a full tank may be a sticky float switch or scale on the float; cleaning with diluted Scale Away in the wash routine is the prescribed path before condemning the pump.
Pump-out failure leaves slurry in the tank and triggers odd freeze behavior; clogged drains or a dirty check valve can look like a dead pump motor during the brief reverse cycle.
Mechanical seal leaks often wet the pump bracket and housing before the motor quits entirely.

Document whether the machine still pumps in WASH with water in the tank. That single test separates motor/capacitor problems from upstream fill issues.

OEM kits, PA0613 to SP-0613, and compatible aftermarket pumps

Genuine Hoshizaki pump-motor kits ship under the material and part numbers in your model’s parts list. Hoshizaki service bulletin SB26-0003 (February 2026) states the PA0613 water pump kit transitions to SP-0613 with no fit, form, or function change—only a standardized kit number and sometimes capacitor labeling (443192-03 versus 4A6435-03, same 5.5MFD / 250VAC spec).

Aftermarket compatible pump-motor assemblies are widely sold for PA0613 applications. They can be appropriate when you need the machine running fast and your documentation already proves PA0613 / 3A2638A03 (or the newer SP-0613 equivalent) for your model and auxiliary code. The risk is catalog copy that spans “KM-450 through KM-900” without citing a parts manual row—those ranges do not match how Hoshizaki assigns HS-0177, S-0731, and SP-5423 on documented models.

When comparing OEM versus compatible, weigh mechanical seal quality, impeller material, and whether the listing includes the correct 5.5MFD capacitor for your board family. For warranty and insurance-sensitive kitchens, OEM remains the conservative pick. For older units out of extended coverage, a verified compatible assembly plus a fresh capacitor is a common field choice—provided the material number on the invoice matches your PDF proof.

Install and upkeep habits that protect the next pump

Pump life ties directly to water quality and cleaning discipline. Hoshizaki maintenance schedules call for checking external water filters, inspecting water hoses, and annual cleaning/sanitizing of the icemaker liner. Scale on spray tubes restricts flow and makes the pump work harder; ignored scale on the evaporator lengthens freeze and drives repeated harvest assists.

During service, lock out power and use the control switch OFF position—factory warnings note OFF does not de-energize every load, so treat the unit as live until verified. Never run WASH with an empty water tank; the manual explicitly warns that running wash dry can damage the pump.

After installation, re-check spray guide alignment, cube guide position, and clamped hoses in the water circuit. Confirm normal ice drop weight returns and that pump-out still clears the tank on the schedule set by S4 dip switch 5. Pairing a new pump with a fresh inlet valve screen clean, float service, and timed descaler/sanitizer cycles (per your cleaner vs sanitizer choice for the site) prevents the replacement from inheriting the same scaled, restricted duty that killed the last motor.

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FAQ

Does PA0613 fit every Hoshizaki KM ice machine?

No. Hoshizaki parts lists assign PA0613 / 3A2638A03 to specific water-circuit families such as KM-515M_H and KM-650M_H, while KM-901M_H50, KM-1340M_H, and KM-520MAJ-E / KM-660MAJ-E use different assembly material numbers and part numbers. Always match your exact model’s B. Water Circuit page before ordering.

What is the difference between PA0613 and SP-0613?

Hoshizaki service bulletin SB26-0003 describes SP-0613 as the standardized successor kit to PA0613, with minor labeling changes and no change to fit, form, or function. Either kit may appear depending on inventory; the pump motor capacitor may show 443192-03 or interchangeable 4A6435-03 at the same 5.5MFD, 250VAC rating.

Should I replace the pump motor capacitor when I change the pump?

Yes. Hoshizaki component service information calls for a new pump motor capacitor whenever the pump motor is replaced. Mid-size M_H models typically use 5.5MFD at 250VAC, while KM-1340M_H uses 10MFD—verify the value on your control-box parts list rather than assuming the capacitor from a generic kit is correct.