This document is an Operation & Preventive Maintenance Manual for PACCAR Winch Models PA55 & PA56, specifically those equipped with electronic controls.

Function Description

The PACCAR Winch Models PA55 and PA56 are power shift winches designed for heavy-duty pulling applications, typically mounted on crawler tractors. Their primary function is to haul in and pay out cable to move loads, utilizing a power shift mechanism for efficient operation. The electronic controls enhance precision and ease of use.

Important Technical Specifications

Models Covered: PA55 and PA56 power shift winches with electronic controls.
Maximum Rated Bare Drum Line Pull:
- PA55: 69,200 LB (307.8 kN)
- PA56: 89,800 LB (399.4 kN)
Wire Rope Requirements:
- PA55: Requires 7/8 inch (22 mm) IPS wire rope with a breaking strength sufficient for the rated line pull.
- PA56: Requires 1 inch (25 mm) IPS wire rope with a breaking strength sufficient for the rated line pull.
Cable Anchor: The cable anchor or ferrule pocket in the drum is designed for self-release in emergencies but will NOT support rated line pull alone. A minimum of five (5) complete wraps of cable must always be maintained on the winch drum for safe operation.
Control System: Electronic controls are integrated for precise operation.
Hydraulic System: Equipped with hydraulic accumulators. Users are warned to discharge stored oil supply before any hydraulic line or fitting removal or servicing to prevent personal injury from sudden oil pressure release. This is done by stopping the engine and cycling the Power Shift control handle into full Haul-In then Pay-Out positions a minimum of five times.

Usage Features

Power Shift Operation: The winches utilize a power shift mechanism, allowing for variable line speeds to match job conditions.
Electronic Controls: The electronic control system is a key feature, providing advanced control over winch functions.
Freespool Adjustment: The manual includes instructions for adjusting the freespool function, which allows the cable to be pulled out manually with less resistance.
Safety Features:
- Brake-On (Neutral) Position: Controls must be in this position before starting the tractor.
- Cable Management: Emphasizes the use of correct size ferrules for cable and pocket, and warns against using knots. It also advises maintaining a minimum of five cable wraps on the drum.
- Ground Stability: Operators must ensure tractor ground stability before winching.
- Personnel Safety: Strict guidelines are provided for keeping ground personnel clear of the winch drum and line under tension, recommending a safe distance of at least 1.5 times the cable length.
- Load Limits: Explicitly warns against exceeding the maximum rated bare drum line pull and suggests using multi-part lines and sheave blocks for excessive loads.
Adaptability: Factory-approved adaptations are designed for specific crawler tractor models. Users are advised to contact PACCAR or a dealer before attempting winch modifications or mounting on a different tractor due to safety limitations.

Maintenance Features

Regular Inspections: Daily inspection of rigging, winch, and tractor is recommended, checking for worn or damaged cables and components.
Preventive Maintenance Schedule: The manual outlines a preventive maintenance schedule and specifications to ensure the longevity and safe operation of the winch.
Recommended Oil: A dedicated section provides information on the recommended oil types for the winch, crucial for proper lubrication and performance.
Accumulator Discharge: A critical safety procedure for maintenance involving the hydraulic system, requiring the discharge of accumulator stored oil before working on hydraulic lines or fittings.
Cleaning and Servicing: Warnings against cleaning, oiling, or performing maintenance with the engine running unless specifically instructed.
Securing Equipment: Before servicing, adjusting, or repairing the winch, all equipment must be lowered to the ground or securely blocked, and tractor parking brakes applied.
Documentation: Users are encouraged to retain the manual for future reference and to contact PACCAR Service Department with the complete winch MODEL NUMBER and SERIAL NUMBER for any inquiries or assistance.

The manual emphasizes safety throughout, using "WARNING" and "CAUTION" emblems to highlight potential hazards and unsafe practices that could lead to personal injury, death, or property damage. It also includes a metric conversion chart for convenience.

Paccar PA55 - Service Manual

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