The best zero-turn hydraulic pump is the one that matches your mower’s model, serial range, and original equipment part number. The PK-BGAB-EY1X-XXXX replacements are listed for certain Toro Z Master Z500 and Exmark Lazer mowers, while the BDP-10A-series option targets specified Exmark Lazer Z serial numbers. The genuine Hydro-Gear pump may suit buyers seeking an OEM part, but the listing provides little fitment detail. The final pick is hydraulic fluid, not a pump, and is included only as a related maintenance option.
| Product | Best For | Key Fitment Detail |
|---|---|---|
| PK-BGAB-EY1X-XXXX replacement | Specified Toro and Exmark mowers | Replaces 103-7262 and 116-2444 |
| Leyuncot replacement pump | Buyers checking the same Toro/Exmark part numbers | Z500 2004 and later; select Lazer models |
| NEWZQ BDP-10A replacement | Specified Exmark Lazer Z units | Serial No. 370,000 and newer; 52-, 60-, and 72-inch decks |
| Genuine Hydro-Gear pump | Buyers seeking an OEM part | Confirm fitment independently |
| TRIAX Trans-Zero fluid | Fluid service where the manual specifies 20W-50 or higher | Not a pump |
PK-BGAB-EY1X-XXXX Toro And Exmark Replacement Pump
This replacement is listed for Toro Z Master Z500 mowers from 2004 and newer, including versions with 60-inch and 72-inch decks. The stated Exmark fitment includes Lazer AS and Lazer Z AC, AS, and LC models. Its listed replacement numbers include PK-BGAB-EY1X-XXXX, PJ-BGAB-EY1X-XXXX, 103-7262, and 116-2444.
Best for: Owners or fleet technicians who can match one of those mower models and part numbers. It was selected for its clearly stated compatibility across specified Toro and Exmark machines. Check before buying: Confirm the mower’s exact model and original pump number; the listed fitment should not be assumed to cover every Z Master or Lazer mower.
Leyuncot PK-BGAB-EY1X-XXXX Replacement Pump
Leyuncot lists this pump as a replacement for PK-BGAB-EY1X-XXXX, PJ-BGAB-EY1X-XXXX, 103-7262, and 116-2444. Its stated applications include Toro Z Master Z500 mowers from 2004 onward with 60- or 72-inch decks, plus Exmark Lazer AS and Lazer Z AC, AS, and LC models. The seller describes it as a precision-manufactured replacement intended to provide hydraulic power.
Best for: Buyers whose mower and existing pump match the listed part numbers and models. It is a useful comparison to the other pump listed for the same application. Limitation: The compatibility description is specific, not universal; verify the exact machine configuration rather than relying on brand name alone.
NEWZQ BDP-10A-Series Exmark Replacement Pump
This pump is listed as a replacement for BDP-10A-433, PG-1GAB-DY1X-XXXX, BDP-10A-427, 103-2675, 103-1943, and 0296440. The stated application is Exmark Lazer Z mowers with serial numbers 370,000 and newer, with 52-, 60-, or 72-inch decks.
Best for: Owners of an Exmark Lazer Z who can confirm the serial number and a matching OE reference. This option was selected because its fitment range differs from the PK-BGAB pump listings and gives buyers another model-specific choice. Check before buying: The listing does not establish fitment for every Exmark Lazer Z generation, so confirm the serial range and pump number.
Genuine Hydro-Gear PG-1GAB-DY1X-XXXX Pump
This product is identified as a genuine original equipment manufacturer Hydro-Gear pump with the part number PG-1GAB-DY1X-XXXX. The provided product information does not specify compatible mower models, deck sizes, or serial ranges.
Best for: Buyers who already know this exact Hydro-Gear part number is required and want an item identified as an OEM part. It was selected because the part number also appears in the NEWZQ replacement listing. Limitation: Fitment details are sparse, so compare the number on the original unit and consult the mower’s parts documentation before ordering.
TRIAX Trans-Zero 20W-50 Hydrostatic Fluid
This product is a gallon of full-synthetic 20W-50 hydrostatic transmission oil, not a hydraulic pump. The listing names many mower brands, including Toro and Exmark, and says it replaces fluids requiring 20W-50 or a higher-viscosity grade. It also describes all-season use and a pour point of -50°F.
Best for: Owners performing fluid service when their mower’s manual calls for a compatible 20W-50 or higher-viscosity fluid. It is included as a related upkeep option, not as a pump replacement. Important limitation: Brand compatibility alone does not prove the fluid is correct for a particular hydrostatic system; follow the mower manufacturer’s specification.
Buying Guide: How To Choose A Zero-Turn Hydraulic Pump
How do you confirm the right pump?
Start with the mower’s model and serial number, then identify the part number on the existing pump or in the manufacturer’s parts documentation. Compare those details with the replacement listing. A similar-looking pump or a shared mower brand is not enough to establish compatibility.
Which details matter most?
- Part number: Match the OE number or an explicitly listed replacement number.
- Model and serial range: Confirm the complete mower designation and any stated serial cutoff.
- Deck size: Treat deck sizes as fitment clues only when the listing names them; they do not independently confirm a match.
- Installation requirements: The first pump listing states that its design matches factory specifications and requires no hydraulic-line modifications for the listed applications. Do not extend that claim to other pumps.
Replacement pump or OEM part?
A replacement listing may provide broad compatibility details, while an OEM listing may be preferable to buyers seeking the named original manufacturer part. In this selection, the Hydro-Gear listing provides limited fitment information, so its part number needs careful verification. Compare documented fitment first, then choose based on whether an aftermarket replacement or the stated OEM part suits your requirements.
When should you consider fluid?
Fluid is not a substitute for a failed pump. Use a fluid product only when performing maintenance and when its viscosity and requirements match the mower’s manual. If a mower has lost drive or hydraulic performance, confirm the cause and the required repair rather than assuming a fluid change will resolve a pump problem.
Frequently Asked Questions
Are these pumps compatible with every zero-turn mower?
No. Each pump has specific part-number, model, or serial-range details. Check those against your mower before purchase.
Can I use a Toro-listed pump on an Exmark mower?
Only if the exact Exmark model and pump number are included in that product’s stated compatibility. Some options name select Exmark Lazer models, but not all.
What does BDP-10A replacement mean?
It indicates that the NEWZQ listing identifies several BDP-10A-series numbers as replacement references. Confirm the original pump number and listed Exmark serial range.
Is the TRIAX product a hydraulic pump?
No. It is hydrostatic transmission fluid. It is relevant to maintenance only when the mower’s specifications call for a compatible fluid.
Should I order based only on deck width?
No. Deck width is one listed fitment detail, but the mower model, serial number, and pump part number are more reliable checks.