Kubota Mini Excavator & Compact Loader Torque Specs

Quick-reference torque specifications for Kubota KX-series mini excavators, U-series compact excavators, and SVL compact track loaders. Always verify against the machine-specific Workshop Manual (WSM) before service; never substitute this table for a factory torque sequence on safety-critical fasteners.

Quick-reference torque specs

Hydraulic Fitting — 9/16"-18 ORB (SAE -06 dash size, 3/8" tube) 22-26 ft-lbs (SAE O-ring boss (ORB) straight-thread fitting into port; wet torque (lubricated). Applies to all Kubota excavators and CTLs using SAE ORB ports.) Source: Tompkins Industries SAE O-Ring Boss Port Specifications table (per SAE J1926/3 & J514); 22 ft-lb listed for dash-06 (9/16"-18). Hydraulic Fitting — 3/4"-16 ORB (SAE -08 dash size, 1/2" tube) 37-37 ft-lbs (Common main-circuit fitting size on KX/U-series boom, arm, and bucket circuits. Wet torque per SAE J1926/3.) Source: Tompkins Industries SAE O-Ring Boss Port Specifications table; 37 ft-lb for dash-08 (3/4"-16). Hydraulic Fitting — 1-1/16"-12 ORB (SAE -12 dash size, 3/4" tube) 70-70 ft-lbs (Often used on hydraulic pump/motor ports and travel motor inlets. Wet torque.) Source: Tompkins Industries SAE O-Ring Boss Port Specifications table; 70 ft-lb for dash-12. Hydraulic Fitting — 1-5/16"-12 ORB (SAE -16 dash size, 1" tube) 111-111 ft-lbs (Larger suction-side or case-drain fittings. Wet torque per SAE J1926/3.) Source: Tompkins Industries SAE O-Ring Boss Port Specifications table; 111 ft-lb for dash-16. Hydraulic Hose Union Nut — 3/8" hose fitting 27-31 ft-lbs (KX057-4/U55-4 WSM Section G-16 hose union-nut torque table. Applies to 3/8" union-nut (non-ORB swivel hose connections).) Source: Kubota KX057-4/U55-4 Workshop Manual, Section G-16, "Torque for Hydraulic Hose Fittings — Union Nuts" (KiSC issued 04, 2021). Hydraulic Hose Union Nut — 1/2" hose fitting 43-47 ft-lbs (KX057-4/U55-4 WSM 1/2" union-nut range from Section G-16. Common at boom cylinder base connections.) Source: Kubota KX057-4/U55-4 Workshop Manual, Section G-16 (KiSC 04, 2021). Hydraulic Hose Union Nut — 3/4" hose fitting 87-94 ft-lbs (KX057-4/U55-4 WSM 3/4" union-nut range from Section G-16. Used on pump-side high-flow hoses.) Source: Kubota KX057-4/U55-4 Workshop Manual, Section G-16 (KiSC 04, 2021). General-Use Bolt M10 (4T grade / no-grade, steel mating surface) 29-33 ft-lbs (Default torque for unspecified M10 bolts in KX057-4/U55-4 WSM. Do NOT use for any joint that has a model-specific spec in the WSM.) Source: Kubota KX057-4/U55-4 Workshop Manual, Section G-16, "General Use Screws, Bolts and Nuts" table (KiSC 04, 2021). General-Use Bolt M12 (4T grade / no-grade, steel mating surface) 47-53 ft-lbs (Default M12 torque from WSM general table. Applies where no specific value is given (e.g., access-cover bolts, bracket hardware).) Source: Kubota KX057-4/U55-4 Workshop Manual, Section G-16 (KiSC 04, 2021). Control Valve Bracket Bolts M12×25 (with Loctite 271) 57-67 ft-lbs (Bracket securing main control valve assembly; Loctite 271 (red thread-lock) required per WSM. Applies to KX057-4/U55-4.) Source: Kubota KX057-4/U55-4 Workshop Manual, Section 3-S6, control valve bracket removal/installation note (KiSC 04, 2021). Track Tension — SVL65-2 / SVL75-2 / SVL75-3 / SVL95-2s / SVL97-2 (sag adjustment, not a torque) 20-30 mm (0.8-1.2 in.) (Distinct from the KX/U-series sag figure above — SVL compact track loaders use a smaller clearance. The five Operator's Manuals describe it as the clearance between the outer end of the track roller and the track's interior surface, with the drive sprocket and idler as reference points; the SVL65-2 Workshop Manual describes the same measurement differently, as the tension dimension checked under the second track roller. Wording differs between the WSM and the Ops Manuals, but the 20-30 mm value is confirmed identical across all six documents.) Source: KUBOTA Corporation, SVL65-2 Workshop Manual (RY921-26261, KiSC 09/2019 A) p.3-17: "Service specification (a) 20 to 30 mm / 0.8 to 1.2 in."; SVL65-2 Operator's Manual (V0212-5811-2) p.109, SVL75-2 Ops Manual (V0522-5814-4) p.70, SVL75-3 Ops Manual (V0532-5811-6) p.183, SVL95-2s Ops Manual (1909-0453/V0631-5812-4) p.96, SVL97-2 Ops Manual (V0642-5811-7) p.126 — each: "Clearance between outer end of track roller and track interior surface (A): 20 mm to 30 mm". Track Tensioner Grease-Fitting Bolt — SVL65-2 / SVL75-2 / SVL75-3 / SVL95-2s / SVL97-2 98-108 N·m (Tightened after adjusting track tension, not a sprocket/idler/roller mounting bolt. Identical value across all five current SVL models' Operator's Manuals (72.3-79.7 ft-lbs per the SVL95-2s manual's printed conversion).) Source: KUBOTA Corporation Operator's Manuals — SVL65-2 (V0212-5811-2) p.110, SVL75-2 (V0522-5814-4) p.85, SVL75-3 (V0532-5811-6) p.184, SVL95-2s (1909-0453/V0631-5812-4) p.95, SVL97-2 (V0642-5811-7) p.127 — each: "After adjustment is completed, tighten the grease fitting using the socket wrench. You must keep the tightening torque as follows. Tightening torque: Between 98 N·m to 108 N·m". Drive Sprocket Mounting Bolt, M16×50 ×9 (shared spec with HST/travel-motor mount bolt) — SVL65-2 ONLY 259.9-304.0 N·m (26.5-31.0 kgf·m / 191.7-224.2 lbf·ft. Loctite 271 required. SVL65-2 only — no free/verifiable Workshop Manual was found for SVL75-2/75-3/95-2s/97-2, so this value must NOT be assumed for those models (see the "See service manual" row below).) Source: KUBOTA Corporation, SVL65-2 (For North America) Workshop Manual (RY921-26261, KiSC 09/2019 A) p.6-117: "(1)(6) Bolt / 259.9 to 304.0 N·m / 26.5 to 31.0 kgf·m / 191.7 to 224.2 lbf·ft / Thread lock (Loctite 271)". Front Idler Mounting Bolt, M12×50 ×4 — SVL65-2 ONLY 77.5-90.2 N·m (7.9-9.2 kgf·m / 52.1-66.5 lbf·ft. Loctite 271 required. WARNING: this exact numeric range is also the cab tilt-lock bolt torque in all five SVL operator's manuals, including SVL65-2's own Operator's Manual (p.84-85: "(1) Lock bolt ... Tightening torque 77.5 N⋅m to 90.2 N⋅m") — an unrelated fastener that happens to share this SVL65-2's front-idler value. Do not apply this value to a cab tilt-lock bolt, and do not apply the cab tilt-lock figure to a front idler bolt.) Source: KUBOTA Corporation, SVL65-2 Workshop Manual (RY921-26261, KiSC 09/2019 A) p.4-21: "(2) Bolt / 77.5 to 90.2 N·m / 7.9 to 9.2 kgf·m / 52.1 to 66.5 lbf·ft / Thread lock (Loctite 271)". Rear Idler & Track Roller Mounting Bolts, M16×45 (×2 rear idler, ×8 track roller) — SVL65-2 ONLY 344-403 N·m (35.1-41.1 kgf·m / 254-297 lbf·ft. Loctite 271 required. Same torque table entry covers both the rear idler and the track roller mounting bolts (both M16×45).) Source: KUBOTA Corporation, SVL65-2 Workshop Manual (RY921-26261, KiSC 09/2019 A) p.4-22 (rear idler) & p.4-23 (track roller): "(1) Bolt / 344 to 403 N·m / 35.1 to 41.1 kgf·m / 254 to 297 lbf·ft / Thread lock (Loctite 271)". Hydraulic O-ring boss (ORB) fitting torque is set by thread size and is the same across makes. Always confirm against your machine’s service manual.

Sequence-required & verify-against-manual fasteners

These structural or safety-critical fasteners require the machine-specific tightening sequence or a service-manual value rather than a single number: Swing Bearing (Slewing Ring) Bolts — inner and outer race — See sequence (Tightening sequence is mandatory; consult model-specific WSM. Bolts are typically high-grade (10.9+) and require thread preparation (anti-seize or Loctite per OEM spec) plus a star/cross tightening pattern. Verify re-torque interval (commonly 50 hrs after replacement).) Source: Kubota WSM procedure (see machine-specific section 1-S7 Swivel Frame); sequence requirement confirmed by industry practice for all tracked excavator swing bearings. Counterweight Mounting Bolts — See sequence (Counterweight is a large unsupported mass; a tightening sequence is mandatory to prevent uneven clamp load. Exact torque varies by model. Consult WSM for your serial-number range before service.) Source: Kubota KX057-4/U55-4 WSM Section 1 (Machine Body / Swivel Frame); specific torque requires model WSM lookup. Track Shoe (Grouser) Bolts — KX/U-series mini excavator — See service manual (Track shoe bolt torque is model-specific and depends on shoe width and bolt diameter (typically M16–M20 high-grade). WSM undercarriage section (Track Frame 1-S34) contains the values. Do not estimate; incorrect torque causes shoe loss or stud failure.) Source: Kubota KX057-4/U55-4 WSM Section 1-S34 (Track Frame) — specific numeric value requires full WSM access. Final Drive / Travel Motor Mount Bolts — See service manual (Travel motor flange bolts are safety-critical; typically M14–M16 high-grade with Loctite. Exact torque in WSM Section 3 (Travel Motor 3-S29). Do not substitute general bolt table values for this joint.) Source: Kubota KX057-4/U55-4 WSM Section 3-S29 (Travel Motor) — numeric value requires full WSM access. Engine Oil Drain Plug — Kubota V2607 (KX057-4 / U55-4) — See service manual (The V2607 engine WSM torque table does not publish a crankcase drain-plug torque in freely-accessible excerpts. Two independent sources confirmed the absence. Typical Kubota small-diesel drain plug range is 18–26 ft-lbs (25–35 N·m) for M14×1.5 plugs, but do not use this estimate — confirm with the engine service manual (Kubota OEM# 9Y111-01039 for V2607).) Source: Kubota V2607 engine tightening torque tables reviewed (enginetechspecs.com, tractorgearbox.com) — drain plug entry not present; see Kubota V2607 Workshop Manual OEM# 9Y111-01039. Track Tension (sag adjustment, not a torque) — See sag note (KX/U-series: set ~80-85 mm track sag via the grease cylinder - an adjustment, not a bolt torque.) Source: Kubota KX057-4/U55-4 Workshop Manual. Drive Sprocket & Track Roller/Idler Mounting Bolts — SVL75-2 / SVL75-3 / SVL95-2s / SVL97-2 — See service manual (No free, non-paywalled, verifiably-OEM Workshop/Service Manual was located for these four models — only Operator's Manuals, which contain no disassembly or torque-table section for the undercarriage. Do NOT carry over the SVL65-2 values above to these models — no source confirms they share the same sprocket/idler/roller hardware. Only paid third-party resellers offer these WSMs.) Source: KUBOTA Corporation Operator's Manuals for SVL75-2 (V0522-5814-4), SVL75-3 (V0532-5811-6), SVL95-2s (1909-0453/V0631-5812-4), SVL97-2 (V0642-5811-7) — no sprocket/idler/roller torque table present in any of the four documents.

Model coverage

KX040-4 (2015–present), Mini Excavator, Kubota D1803-CR-TE4, 3-cyl, 1,826 cc, Tier 4; KX057-4 (2009–present), Mini Excavator, Kubota V2607-DI, 4-cyl, 2,615 cc, Tier 4 Interim; U35-4 (2008–present), Compact Excavator (Zero Tail Swing), Kubota D1703M-DI-E4, 3-cyl, 1,647 cc, Tier 4; U55-4 (2012–present), Compact Excavator (Zero Tail Swing), Kubota V2607-CR-E4, 4-cyl, 2,615 cc, Tier 4; SVL75-2 (2014–present), Compact Track Loader, Kubota V3307, 4-cyl, Tier 4 Final; SVL95-2s (2014–present), Compact Track Loader, Kubota V3307-CR-TE4, 4-cyl, Tier 4 Final / SCR.

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