John Deere 640D Skidder & 648D Grapple Skidder Technical Manual

This technical manual provides comprehensive service and repair procedures for the John Deere 640D Skidder and 648D Grapple Skidder, covering all aspects from removal to installation. Ref: TM1440

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Document Details

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Document Number / Seller:
28831 / Matthew Lopez
File Size:
196.67 MB
File Type:
PDF
Language:
English
Pages:
969
Printable:
Yes
Category:
Skidder
Last updated / verified
May 12, 2025

Models Covered & Key Technical Specifications

John Deere 640D Skidder & 648D Grapple Skidder (TM1440) -- 1990

Covers 640D Skidder and 648D Grapple Skidder Service Procedures | Technical Manual Suite.

  • Technical Resolution Data: 794 kg (1750 lb) is the approximate weight of the front differential and axle assembly.
  • Specific Temperature Range: For optimal hydraulic system operation, 36-44°C (97-111°F) is the recommended oil temperature.
  • Essential Power Rating: 2000 psi is the maximum hydraulic system operating pressure for the 640D Skidder.
  • Advanced Memory Capacity: The hydraulic system has a displacement pump capacity of 25 gpm (95 L/min) for standard operation.
  • Core Speed Performance: Net engine power is rated at 128 hp (95 kW) at 2200 rpm.
  • Designated Torque Values: 908 N-m (670 lb-ft) is the specified torque for rear axle-to-frame nuts.

Professional Workshop Service Manual & Technical Specifications

Precision Calibration Manual: John Deere 640D Skidder Technical Manual for John Deere 640D Skidder & 648D Grapple Skidder - Comprehensive Service & Repair Procedures Specification-Guide

Product-Line: John Deere // Conceptual-Layout: Transmission and Axle Specifications / Hydraulic System Logic // Diagnostic-Area: Torque Values. Following OEM groupings, the manual includes detailed information on engine, chassis, hydraulic systems, brakes, and more.

  • General Specifications: Provides dimensional data, weights, and capacities.
  • Torque Values: Details specific torque settings for various fasteners and components.
  • Fuels and Lubricants: Outlines fuel type recommendations and lubrication schedules.
  • Axles and Suspension System: Covers removal, installation, and specifications for axles and differentials.
  • Transmission: Details removal, installation, and component-specific procedures for the transmission system.

This manual documents torque specifications for flange face sealing to ensure proper assembly. Factory specifications are documented for precise component installation and alignment, ensuring optimal performance and longevity of the equipment.

FAQ

Specify the lubrication requirements for the drive shafts. keyboard_arrow_down

Multi-purpose grease is recommended for the splines of plug yokes and slip yokes, as well as for grease fittings on joints. Ensure grease fittings are properly oriented for optimal lubrication.

What is the exact testing parameters for the differential lock valve spring? keyboard_arrow_down

The differential lock control valve spring requires a test length of 33.3 mm (1.31 in.) at 47 ± 4.5 N (10.5 ± 1 lb force).

Calculate the specific diagnostic procedures for differential case air leakage. keyboard_arrow_down

Plug all case holes except for grease fitting and air inlet, then attach a snubber valve and gauge to the inlet passage. Adjust pressure to 69 kPa (0.7 bar or 10 psi) and monitor for pressure drops over 5 minutes; apply liquid soap to suspected joints to find leaks.

What values are designated for fluid capacity requirements? keyboard_arrow_down

The transmission and transfer case have an oil capacity of approximately 23 L (6 gal), and the hydraulic oil capacity is approximately 17 L (4.5 gal) for the front differential removal.

Assess the critical component identification for the axle housing grease dam. keyboard_arrow_down

Wear measurement (B) is the distance between the grease dam housing shoulder and the grease dam bearing cup shoulder, which should be measured in three locations, 120° apart.

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Reviews (5)

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Great information on servicing both models. The download was smooth and the support team was very helpful!
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I appreciate the thoroughness of the manual. Received my download link promptly, very professional service!
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The manual is incredibly detailed and easy to follow. Helped me fix my 640D in no time!
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The diagrams are clear and the instructions are precise. The email support was quick when I had questions!
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Rated 5 out of 5 stars