Cat 931C Series II LGP and 2 related models specifications

History and service record of 931C Series II LGP and 2 related models

• 931C II with no pulling power in 2nd and 3rd. A Heavy Equipment Forums owner of a 931C II with the 3F/3R transmission says second and third gear engage but barely move the loader at low rpm while first works at high rpm, and the left steering pedal only works fully depressed; a reply said these machines are not made to be used at low throttle and to check brake adjustment and worn rollers on the steering clutch actuators. Cat 931C II transmission no power in 2 and 3, Heavy Equipment Forums.
• D3C II that lost second gear when warm. A Yesterday's Tractors thread about a D3C II with the 3-forward, 1-reverse transmission describes second gear disappearing when the machine runs hard and warm, jumping from first to third; replies suggested a clutch piston seal and said to fit a 600 psi gauge to check pump pressure through the gears at low idle with warm oil, and that the manual says to clean the screen every 250 hours. Cat D3C II, Yesterday's Tractors forum.
• Hydrostatic C versus G series. A Heavy Equipment Forums buyer comparing the hydrostatic D3C to D5C with the G series notes the C models use a Cat 3045 and the G a 3046, and cites Cat weights of 17,050 lb for the D3G, 18,172 lb for the D4G and 20,504 lb for the D5G in XL form. Cat dozer 3, 4, 5, C series vs Cat G series, Heavy Equipment Forums.
• Leak under the rear plate. Another thread asks about a significant hydraulic leak around the bottom plate under the rear of a D3C Series II, a plate held by two bolts and two welds, and a reply notes a serial number would help get the correct information. D3C series ii dozer, Heavy Equipment Forums.
• 931 is a D3 with a loader frame. On Heavy Equipment Forums a poster with an older 931 (serial 78U) said the 931 is basically a D3 with a loader frame, that the service manual refers to the D3 as well as the 931 almost throughout, and that some parts such as the final drive pinion gear are no longer available from Cat. Early Cat 931 thread, Heavy Equipment Forums.
• 931 transmission service advice. In the same thread a poster who dismantled a 931 advised a good service on the transmission because they cost a lot to fix, and another warned that crossover hydraulic tubes under the floor for lift and tilt are in some cases unavailable and may have to be duplicated by a hydraulic shop. Early Cat 931 thread, Heavy Equipment Forums.
• 931 B and C models, used prices. On Yesterday's Tractors a poster noted that the 931 went through B and C models, with later B models getting an improved direct injection engine and another track link, while a poster in British Columbia said a fully functioning 931 was unlikely under $5000 and a really good one could still be more than $15000. Cat 931 crawler loader value, Yesterday's Tractors.

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