Parker Calzoni MRT Series Radial Piston Motor (MRT 7100)

The Parker Calzoni MRT Series is a heavy-duty, fixed displacement radial piston motor designed for high-torque, low-speed (LSHT) applications. The specific model MRT 7100 features a massive displacement of 7100 cm³/rev, utilizing Calzoni’s legendary swiveling cylinder technology to deliver up to 96% mechanical efficiency. It is the powerhouse of choice for the most demanding heavy industry applications, such as ship propulsion drives and industrial shredders, where consistent torque and reliability are non-negotiable.

Key Features:

Series: MRT (Mega Torque)
Model: MRT 7100 (Code 0710)
Displacement: 7104 cm³/rev (7.1 Liters!)
Max. Torque: ~28,000 Nm (at 250 bar)
Technology: Radial Piston with Telescopic Cylinders.

Product Overview The Parker Calzoni MRT 7100 stands at the top of the hydraulic motor hierarchy. Engineered originally by Calzoni (now part of Parker Hannifin), the MRT series distinguishes itself from standard radial motors by eliminating the connecting rod side-forces. This is achieved through a unique design where the cylinders swivel on the crankshaft, ensuring pure linear force transmission. This results in virtually wear-free operation and exceptionally high starting torque efficiency.

Why Choose Parker Calzoni MRT?

Massive Torque Density: Capable of generating enormous torque directly at the driveshaft, eliminating the need for large gearboxes in many applications.
Unrivaled Efficiency: The patented design offers mechanical efficiencies typically above 96%, significantly reducing energy loss and heat generation.
Low Speed Stability: Can operate smoothly at extremely low speeds (down to 0.5 rpm) without “cogging,” essential for precise positioning or slow crushing operations.
Durability: The hydrostatic balancing of the pistons ensures a long service life even under heavy shock loads.

Common Applications:

Marine: Main Propulsion Drives, Bow Thrusters, Heavy Winches.
Recycling: Mega-Shredders (Scrap metal processing).
Mining: Bucket Wheel Excavators, Apron Feeders.
Sugar Industry: Mill Drives.

Specification	Value / Description
Product Type	Radial Piston Hydraulic Motor (LSHT)
Brand	Parker Calzoni (formerly Denison Calzoni)
Series	MRT Series
Model Code Reference	MRT-0710P-N1M1F1N1N
Displacement ( $V_g$ )	7104 cm³/rev (433.5 in³/rev)
Nominal Pressure	250 bar (3600 psi)
Peak Pressure	300 bar (4350 psi)
Specific Torque	~113 Nm / bar
Max. Torque (Theoretical)	28,250 Nm (@ 250 bar)
Max. Speed ( $n$ )	150 – 200 rpm (Low speed optimized)
Shaft Type (N1)	Splined Shaft (DIN 5480) or Keyed (check specific code)
Distributor	Integrated flat distributor
Weight	Approx. 900 kg (Very Heavy Unit)