HYDBK1 | Hydraulic Motor Pump Base Kit 1 with Mounting Hardware

HYDBK1 | Hydraulic Motor Pump Base Kit 1 with Mounting Hardware | Close-Couple Base

HYDBK1 is the foundation most compact hydraulic wash systems should start on: Annovi Reverberi’s factory base kit that turns a pump, a motor, and an afternoon into a finished, aligned, vibration-managed drive assembly. The kit centers on a 12″ × 18″ × 1-5/8″ zinc-plated 10-gauge steel base plate, pre-drilled for AR’s XT, XM, RK, RC, and XW series pumps on their standard mounting rails, and includes the close-couple hydraulic motor flange with spacers (where required for the 5/8″ hollow-shaft RC, XT, and XM builds), rubber isolation feet, and the miscellaneous mounting hardware that otherwise consumes a parts run. Pump, motor, and accessories are sold separately — the HYDBK1 is the platform they land on.

The value is precision you don’t have to create. A fabricated base means laying out bolt patterns from the pump’s foot dimensions, drilling to tolerance, sourcing a flange, and hoping the centerline lands true; AR’s factory base arrives with every hole where the pump and motor expect it, because it was drilled from the same drawings the pumps were built from.

HYDBK1 Specifications

• SKU: HYDBK1
• Configuration: Hydraulic base kit — close-couple architecture
• Base Plate: 12″ × 18″ × 1-5/8″, zinc-plated 10-gauge steel
• Pump Compatibility: AR XT, XM, RK, RC, and XW series pumps with standard mounting rails
• Motor Compatibility: HYDM083, HYDM116M, HYDM180M, HYDM320, AR4769, AR4770
• Included: Close-couple hydraulic motor flange and spacers (where required for 5/8″ hollow-shaft RC, XT, and XM series)
• Included: Rubber feet and miscellaneous mounting hardware
• Not Included: Pump, motor, and accessories — sold separately

Close-Couple: The Simplest Drive There Is

The HYDBK1 builds the hollow-shaft architecture: the pump slides directly over the motor shaft through the included flange, putting both components on one centerline with no coupler to align, no belt to tension, and no guard to fabricate. For AR’s hollow-shaft compact pumps, that is the factory-intended drive — minimal parts, minimal length, and a footprint that fits cabinets, tool compartments, and skid corners. If your pump carries the solid “NL” shaft instead, the flex-coupled HYDBK2 is the correct base; WSHPWR will confirm your shaft configuration against the right kit in one call.

Matched to the Small-Frame Motor Class

The compatible motor list spans AR’s 5/8″-shaft hydraulic motors — from the 8.3cc HYDM083 through the HYDM180M and the AR4769/AR4770 — the displacement range that drives compact pumps at rated speed on ordinary auxiliary circuits. Choose the motor by your machine’s oil flow (WSHPWR will run the displacement math with you), land it on the HYDBK1’s flange, and the base’s pre-drilled pattern guarantees the assembly bolts together the first time.

Vibration and Service, Handled at the Base

A triplex pump is a reciprocating machine, and what it sits on decides how the installation ages. The 10-gauge plate spreads the load, the rubber feet isolate pulsation from the deck or cabinet floor, and the zinc plating shrugs off the wet environment every wash system lives in. Because the whole assembly is one bolted unit, it moves as one — into the truck, out for service, onto the bench — which is exactly how fleet shops want drive systems packaged.

Installation Notes

Confirm your pump series and rail configuration, and your motor’s shaft size, against the compatibility lists before ordering. Assemble pump and motor on the HYDBK1 per the flange instructions, torque to spec, mount through the rubber feet to a flat surface, and verify motor rotation before first pressurization. The base accepts the assembly in either orientation — plan hose routing and the pump’s service side before final bolt-down.

HYDBK1 Key Features & Applications

• Factory-drilled 12″ × 18″ zinc-plated base for XT, XM, RK, RC, and XW series pumps — every hole where the drawings say.
• Close-couple flange and spacers included for the hollow-shaft build — no coupler, no alignment.
• Fits AR’s 5/8″-shaft motor class: HYDM083 through HYDM180M, AR4769, AR4770.
• Rubber isolation feet and mounting hardware in the box — one order, one assembly.
• One bolted unit for installs and service — cabinet, skid, and truck-compartment ready.
• Ideal for compact hydraulic washdown builds, service trucks, skid systems, and fleet shops standardizing their small-frame assemblies.