New Holland 912 1100 1112 1114 Speedrower Windrower & 1495 Mower Conditioner Service Manual 40841501

Brands: Sperry New Holland / New Holland Agriculture

Equipment Type: Windrower / Mower-Conditioner

Manuals Type: Service Manual

Machine Model & Serial Number: 912, 1100, 1112, 1114 Speedrower Windrower & 1495 Mower-Conditioner

Region: N/R

Book Code: 40841501

Issued: Reprinted July 1984

Language: English

Pages: 64

File Format: Portable Document Format (PDF)

Remark: High-value specialized factory service manual for Cessna Hydrostatic Transmissions. Nuclear Level Detail: Contains complete internal overhaul and reconstruction procedures for hydrostatic pumps and motors. Features exhaustive technical data for closed-loop oil flow, charge check systems, and high-pressure relief valve (4350 PSI) calibration. Specifically designed for Speedrower and Haybine propulsion systems. Note: This is a dedicated transmission overhaul manual and does not include internal engine overhaul.

Table of contents

• HYDRAULIC SYSTEM
  • Common Reservoir Operation (Hydraulic and Transmission Integration)
  • Oil Flow in the Transmission (Closed Loop Principles)
  • Charge Oil Requirements and 65 PSI Check Valve Operation
  • Relief Valve Logic and Motor Stall Protection
  • Oil Flow in the Hydrostatic Pump (Piston and Cam Plate Interaction)
  • Oil Flow in the Hydrostatic Motor (High/Low Range Speed Control)
  • Oil Flow in the Valve Plate (Kidney Ports and Charge Check Valves)
• TROUBLESHOOTING
  • Test #1: Transmission Charging System (Engine Not Running)
  • Test #2A: Transmission Charging System (Engine Running)
  • Test #2B: Transmission Charging System (Engine Idling Diagnostics)
  • Test #3: Hydrostatic Linkage Inspection (Pintle Arm and Ball Joints)
  • Test #4: Transmission Power Output (Load and Grade Testing)
  • Test #5A: Check Relief Valves (Forward vs Reverse Symptom Analysis)
  • Test #5B: Relief Valve Service (Matched Sets and Spool Identification)
  • Test #6: Check Controls (Neutral Switch and Linkage Binding)
  • Speed Control Lever Vibration Correction (Specific to Models 912, 1112, 1114)
• REPAIRING TRANSMISSION OIL LEAKS
  • Gasket Leakage (Valve Plate to Housing Interface)
  • Pintle Shaft Leakage (Style I and Style II Seal Repair)
  • Shuttle Valve Plug Leakage (Loctite Removal and Heat Application)
• REMOVING TRANSMISSIONS FROM THE MACHINE
  • Model 912, 1112, and 1114 Removal Sequence
  • Model 1100 and 1495 Removal Sequence
• TRANSMISSION OVERHAUL (DEEP-LEVEL RECONSTRUCTION)
  • Disassembly (Rotating Piston Block Unit Removal)
  • Internal Component Inspection and Identification
    • Shaft Needle Bearings and Oil Seal Critical Surfaces
    • Cam Plate Scoring and Contamination Analysis
    • Rotating Piston Block and Loading Pin Action
    • Valve Plate Dry-film Lubricant and Polishing Limits
    • Kidney Ports and Feathering Notches Identification
  • Reassembly (Gasket Selection and Critical Bolt Torques)
• SYSTEM CLEANING AND FLUSHING (Hoses, Cooler, and Reservoir)
• REINSTALLATION AND RUN-IN PROCEDURES
• APPROVED LUBRICANTS AND FLUID SPECIFICATIONS (John Deere J20A, Dexron II, SAE 10W-40)

Professional Overhaul Insight
Absolute cleanliness is the single most important factor when servicing Cessna hydrostatic units. The hydraulic system must be thoroughly flushed before reinstalling a rebuilt transmission to prevent immediate failure of the high-precision piston shoes. Note that relief valves are factory-set and must only be replaced as matched sets. Ensure the valve plate arrow is correctly oriented for Windrower applications to align charging ports with the closed-loop kidney ports.