Model IG 10
Built 1990
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John Deere Engine: RG6076H135586
Model: 6076HF030
Made: 1990

Deere Injector pump oRings: R73821

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Tub Spindle Bearings
LM11910 - 056
LM11949 - 061
LM67048 - 018
LM67010 - 004
Seal # 2900055

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Vertical Roller Disk #2: 4500972 $ 173

Horizontal Roller 
  Disk: 4700116
  https://www.ebay.com/itm/257323742144 - axle 
  Dexter 5-Lug Hub/Spindle End Unit

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The John Deere 6076HF030 is a 7.6L, 6-cylinder, inline "Series 400" diesel engine commonly used in OEM industrial applications, such as construction equipment (e.g., 644G loaders, 750C/850C dozers) and generators. It is part of the 6076 Waterloo-produced engine series, known for needing robust, precise rebuilds. 
RDO Equipment Co.
RDO Equipment Co.
 +4
Key Engine Details:
Engine Type: 6-cylinder, 4-stroke, Diesel (Inline).
Displacement: 7.6 L (466 cu. in.).
Series: 400 (6076).
Application: OEM Industrial (6076HF030).
Common Applications: 644G Loader, 750C/850C Bulldozers, 770B/772B Graders. 
RDO Equipment Co.
RDO Equipment Co.
 +3
Support and Maintenance:
Parts and Service: Available from official dealers, including overhaul kits. Detailed parts manuals (such as this and this from Repairs Advisor) and service documentation are critical for repairs.
Rebuild Notes: Rebuilding requires attention to wet sleeve liner protrusion, with counterbore repair often necessary to prevent coolant leaks into the oil.
Components: Uses specialized cooling nozzles for pistons, and the fuel system typically features Stanadyne injection nozzles. 
RDO Equipment Co.
RDO Equipment Co.