Bobcat Skid Steer & Compact Loader Torque Specs

Quick-reference torque specifications for Bobcat S-series wheeled skid steers, T-series compact track loaders, and E-series compact excavators. Always verify against the specific model's OEM service manual before performing safety-critical fastener work.

Quick-reference torque specs

Wheel Nut (S650, 9/16" bolts) 160 ft-lbs (217 Nm) (Install torque; recheck at 140 ft-lbs; eight 9/16" wheel bolts; check every 10 hrs or daily for first 30 hrs of service. Socket size: this O&M-sourced spec describes 9/16" wheel bolts. A 22 mm socket (M14-1.5 stud) is separately reported for 2024-build S650 machines — 9/16" and M14 are near-identical diameters in incompatible thread systems, so they cannot both describe the same hardware. Confirm against your own machine before buying studs or nuts; the Bobcat lug wrench (part 6655933) is listed with 7/8", 15/16", 1" and 1-1/16" sockets across the range, so socket size genuinely varies by model and build year.) Source: Bobcat S650 Operation & Maintenance Manual 6987167-EN (2011). Hydraulic Fitting — ORB 9/16"-18 (dash-06, 3/8" tube) 22-26 ft-lbs (30-35 Nm) (Straight-thread O-ring Boss (ORB) fitting; 22 ft-lb for ORB-to-JIC/pipe (SAE J1926/3), 26 ft-lb for ORB-to-ORFS (SAE J1453); wet torque; +25%/-0% tolerance per SAE J2593; make-independent standard) Source: SAE J1926 / SAE J1453 — Tompkins Industries SAE O-Ring Boss Port Specifications table (published by Midland Industries). Hydraulic Fitting — ORB 3/4"-16 (dash-08, 1/2" tube) 37-52 ft-lbs (50-71 Nm) (37 ft-lb for ORB-to-JIC/pipe, 52 ft-lb for ORB-to-ORFS; wet torque; lower end of range is typical for standard hose/manifold ports on Bobcat skid steers; make-independent standard) Source: SAE J1926 / SAE J1453 — Tompkins Industries SAE O-Ring Boss Port Specifications table. Hydraulic Fitting — ORB 7/8"-14 (dash-10, 5/8" tube) 44-74 ft-lbs (60-100 Nm) (44 ft-lb for ORB-to-JIC/pipe, 74 ft-lb for ORB-to-ORFS; common on lift cylinder and loader-arm hydraulic lines; make-independent standard) Source: SAE J1926 / SAE J1453 — Tompkins Industries SAE O-Ring Boss Port Specifications table. Seat Bar Hinge Bolt (S650 / S-series) 25-28 ft-lbs (34-38 Nm) (Hinge bolt securing seat bar to cab pivot; do not lubricate; replace if damaged; correct function of seat bar system is safety-critical) Source: Bobcat S650 Operation & Maintenance Manual 6987167-EN — Seat Bar hinge bolt specification. Operator Cab Mounting Nuts (S650 / S-series) 40-45 ft-lbs (54-61 Nm) (Washers and nuts (both sides) securing cab to mainframe; torque increases when cab is equipped with options/accessories; check all lift-point hardware before machine lifting) Source: Bobcat S650 Operation & Maintenance Manual 6987167-EN — Operator Cab mounting specification. Travel Motor / Final Drive Mount Bolts (E-series) 78-85 ft-lbs (105-115 Nm) (E35 (same platform likely E32/E50); apply Loctite 242 to threads.) Source: Bobcat E35 Service Manual (OSS# 6300543830). Drive Sprocket-to-Motor Bolts (E-series) 80 ft-lbs (108 Nm) (E35; apply Loctite 242 to threads.) Source: Bobcat E35 Service Manual (pp. 514/534). Track Sprocket Nuts (T-series, 6/8-nut hub) 363-401 ft-lbs (492-544 Nm) (T650 earlier 6/8-nut hubs; follow the cross-pattern (A-H) sequence, then repeat.) Source: Bobcat T650 O&M Manual (p. 192). Track Sprocket Bolts (T-series, 16-bolt hub) 90-100 ft-lbs (125-135 Nm) (T650 later 16-bolt hubs; alternating sequence, then repeat.) Source: Bobcat T650 O&M Manual (p. 192). 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: Wheel Nut (S570, 9/16" bolts) — See service manual (S570 O&M Manual (6990680enUS) references wheel nut torque at page 175; same wheel nut check cadence applies — verify per your VIN/manual edition) Source: Bobcat S570 Operation & Maintenance Manual 6990680enUS (2016). Track Drive Sprocket Nuts/Bolts (T770) — See service manual (T770 sprocket-hardware torque not confirmed in public excerpts; T650 values are listed separately above. Verify against the T770 service manual.) Source: Bobcat T650 Operation & Maintenance Manual — Service Schedule, track drive sprocket reference to page 190. Track Shoe / Pad Bolts (T-series, E-series rubber or steel track) — See service manual (Torque and sequence specified in undercarriage section of each model's service manual (T770 manual 6990265enUS; E50 manual); values vary by track type (rubber vs. steel) and shoe bolt count) Source: Bobcat T770 Service Manual 6990265enUS; Bobcat E50 Service Manual — Track Undercarriage Components sections. Swing Bearing / Slew Ring Bolts (E-series excavators) — See sequence (Structural fastener requiring torque sequence; consult E35/E50 service manual Swing Circle Gear section; follow star/cross pattern to seat bearing evenly) Source: Bobcat E35/E50 Service Manual — Swing Bearing Removal/Installation section (table of contents confirmed). Bucket Cutting-Edge Bolts — See service manual (Torque not found in accessible manual sections; bolt grade and thread size vary by bucket model; consult the attachment-specific Bobcat service/parts manual) Source: N/A — value not confirmed in researched sources. Engine Oil Drain Plug (Kubota diesel, S650/T650/E-series) — See service manual (No single universal Kubota drain plug torque found in publicly accessible sources; Kubota V3307-DI-T Workshop Manual (ManualsLib) contains Tightening Torques section at page 81; consult engine serial-number-specific workshop manual) Source: Kubota V3307-DI-T-E2B Workshop Manual (ManualsLib) — section 3 Tightening Torques, page 81 (exact value requires full PDF). ROPS / Counterweight Structural Bolts — See sequence (Safety-critical structural fasteners; tightening sequence and staged torque required; check for proper torque before any machine lifting per Bobcat safety warnings) Source: Bobcat S650/T650 O&M Manuals — BEFORE LIFTING LOADER safety notice; Single Point Lift hardware torque check. Track Tension (sag adjustment, not a torque) — See sag note (T-series: set 19-22 mm (3/4-7/8 in) sag at the middle roller via the grease cylinder - an adjustment, not a bolt torque.) Source: Bobcat T650 O&M Manual (pp. 183-186).

Model coverage

S570 (2016-2024), Skid Steer (wheeled), Bobcat turbocharged diesel; S650 (2010-2024), Skid Steer (wheeled), Kubota V3307-DI-T-EU3; S770 (2012-2024), Skid Steer (wheeled), Bobcat turbocharged diesel; T650 (2013-2024), Compact Track Loader, Bobcat turbocharged diesel; T770 (2012-2024), Compact Track Loader, Bobcat turbocharged diesel; E35 (2012-2024), Compact Excavator (tracked), Kubota diesel; E50 (2012-2024), Compact Excavator (tracked), Kubota diesel.

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