The PACCAR PA55 and PA56 Series Power Shift Winches are a single drum unit which mounts on the rear of a crawler tractor. It is driven by engine power through the tractor PTO (Power Take-Off). The winch may be operated independently or with the tractor transmission engaged. When operated properly, it is capable of utilizing maximum engine horsepower. The winch has equal speed gearing, power-in and power-out, using multiple-disc oil actuated friction clutches and a spring applied hydraulically released multiple-disc oil brake.
The winch may be manufactured as a Standard PTO or Low PTO configuration, depending on tractor application. In the standard PTO configuration, the bevel gear group, clutch and brake components are located in the upper bores of the winch case.
PA55, 3-Shaft, Standard PTO Shown
The Low PTO winch design has the bevel gear group, clutch and brake components located in the lower bores of the winch case.
The Model PA55 may have either a 3-shaft or 4-shaft gear train configuration depending upon the tractor horsepower, PTO speed and line speed requirements of the winch application. All PA56 series winches are 4-shaft configuration.
The standard Power Shift (PS) Winch is primarily used in logging, land clearing and general utility applications. The standard speed model has gear ratios which match the cable drum rotation in Reel-In (forward) to reverse track speeds for optimum advantage in tractor recovery.
Optional features increase the winches ability to meet specific application requirements. Options available for the PA55 & PA56 series winches include:
- * Gear Ratios
- * Three or Four Roller Fairleads
The winch model number is an important reference as to what optional components were used when the winch was manufactured. The winch identification plate is located on the right hand side of the winch case. The serial number is also stamped into the upper right hand mounting pad.
Important: Always refer to the serial number and model number when requesting information or service parts.
The winch model number contains the following configuration data: