Kohler — Oil Change

A Kohler service procedure — check it applies to your exact model before use.

Procedure

1. Add KOHLER PRO Series fuel treatment or equivalent to fuel tank. Run engine 2-3 minutes to get stabilized fuel into fuel system (failures due to untreated fuel are not warrantable).
2. Change oil while engine is still warm from operation (NOT required if using KOHLER PRO 10W-50 full-synthetic oil). Remove spark plug(s) and pour about 1 oz. of engine oil into cylinder(s). Replace spark plug(s) and crank engine slowly to distribute oil.
3. Disconnect negative (–) battery cable.
4. Store engine in a clean, dry place. 5 Speciﬁ cations 16 690 01 Rev. I KohlerEngines.com Dimensions in millimeters. Inch equivalents shown in [ ]. Engine Dimensions with Low-Proﬁ le Air Cleaner 4X Ø 9.005 ± 0.035 [.355 ± .0014] 254.00 B.C. [10.000] 37.00 [1.46] 6 Speciﬁ cations KohlerEngines.com 16 690 01 Rev. I 37.00 [1.46] 4X Ø 9.005 ± 0.035 [.355 ± .0014] 254.00 B.C. [10.000] Dimensions in millimeters. Inch equivalents shown in [ ]. Engine Dimensions with Heavy-Duty Air Cleaner 7 Speciﬁ cations 16 690 01 Rev. I KohlerEngines.com GENERAL SPECIFICATIONS3,6 ZT710 ZT720 ZT730 ZT740 Bore 83 mm (3.27 in.) Stroke 67 mm (2.64 in.) 69 mm (2.72 in.) Displacement 725 cc (44 cu. in.) 747 cc (46 cu. in.) Oil Capacity (reﬁ ll) 1.6-1.8 L (1.9-2.1 qt.) Maximum Angle of Operation (@ full oil level)4 25° TORQUE SPECIFICATIONS3,5 ZT710 ZT720 ZT730 ZT740 Auto Choke eChoke™ Stepper Motor to Bracket Fastener Air Cleaner Base to Mounting Studs 3.1 N·m (27.4 in. lb.) 6.2-7.3 N·m (55-65 in. lb.) Baﬄ e and Sheet Metal into Aluminum M5 Thread Forming Fasteners 8.5 N·m (75 in. lb.) into new hole 4.0 N·m (35 in. lb.) into used hole M6 Thread Forming Fasteners 10.7 N·m (95 in. lb.) into new hole 7.3 N·m (65 in. lb.) into used hole Blower Housing and Sheet Metal M3 HI-LO Screw 2.3 N·m (20 in. lb.) M4 HI-LO Screw 2.8 N·m (25 in. lb.) M5 Thread Forming Fasteners 3.4 N·m (30 in. lb.) Carburetor Mounting Nut 6.2-7.3 N·m (55-65 in. lb.) Chopper Screen (Metal) Fan Fastener 10.0 N·m (88 in. lb.) Screen Fastener 4.0 N·m (35 in. lb.) Metal Guard Fastener 2.6 N·m (23 in. lb.) ENGINE IDENTIFICATION NUMBERS Kohler engine identiﬁ cation numbers (model, speciﬁ cation and serial) should be referenced for eﬃ cient repair, ordering correct parts, and engine replacement. Model . . . . . . . . . . . . . . . . . . . . . ZT710 Conﬁ dant Engine Numerical Designation Speciﬁ cation . . . . . . . . . . . . . . . ZT710-0001 Serial . . . . . . . . . . . . . . . . . . . . . 4923500328 Year Manufactured Code Factory Code Code Year 49 2019 50 2020 51 2021 3 Values are in Metric units. Values in parentheses are English equivalents. 4 Exceeding maximum angle of operation may cause engine damage from insuﬃ cient lubrication. 5 Lubricate threads with engine oil prior to assembly. 6 Any and all horsepower (hp) references by Kohler are Certiﬁ ed Power Ratings and per SAE J1940 & J1995 hp standards. Details on Certiﬁ ed Power Ratings can be found at KohlerEngines.com. 8 Speciﬁ cations KohlerEngines.com 16 690 01 Rev. I TORQUE SPECIFICATIONS3,5 ZT710 ZT720 ZT730 ZT740 Connecting Rod Cap Fastener (torque in increments) Black Coating Gray Metallic Coating 11.3 N·m (100 in. lb.) 13.6 N·m (120 in. lb.) Crankcase Breather Assembly Breather Reed Cover Stud Breather Reed Cover Hex Nut Breather Cover Fastener 6.2 N·m (55 in. lb.) into new hole 4.0 N·m (35 in. lb.) into used hole 1.3 N·m (12 in. lb.) 6.2 N·m (55 in. lb.) into new hole 4.0 N·m (35 in. lb.) into used hole Oil Drain Plug 13.6 N·m (10 ft. lb.) Cylinder Head Head Bolt Fastener (torque in 2 increments) ﬁ rst to 22.6 N·m (200 in. lb.) ﬁ nally to 41.8 N·m (370 in. lb.) Rocker Arm Stud 11.3 N·m (100 in. lb.) Rocker Arm Adjuster Setscrew 7.9 N·m (70 in. lb.) Flywheel Retaining Screw 74.5 N·m (55 ft. lb.) Fuel Pump Screw 2.8 N·m (25 in. lb.) Governor Lever Nut 6.8 N·m (60 in. lb.) Ignition Spark Plug 27 N·m (20 ft. lb.) Module Fastener 4.0-6.2 N·m (35-55 in. lb.) Rectiﬁ er-Regulator Fastener 4.0 N·m (35 in. lb.) Intake Manifold Mounting Fastener (torque in 2 increments) ﬁ rst to 7.4 N·m (66 in. lb.) ﬁ nally to 9.9 N·m (88 in. lb.) Muﬄ er M8 Hex Nuts 24.4 N·m (216 in. lb.) M8 Lock Nuts 27.8 N·m (246 in. lb.) 5/16-18 Capscrew 16.9 N·m (150 in. lb.) Bracket Screw 9.9 N·m (88 in. lb.) Oil Pan Fastener 24.4 N·m (216 in. lb.) Oil Pump Screw (no torque sequence) 9.9 N·m (88 in. lb.) 3 Values are in Metric units. Values in parentheses are English equivalents. 5 Lubricate threads with engine oil prior to assembly. 9 Speciﬁ cations 16 690 01 Rev. I KohlerEngines.com TORQUE SPECIFICATIONS3,5 ZT710 ZT720 ZT730 ZT740 Oil Sentry™ Pressure Switch 4.5 N·m (40 in. lb.) Retractable Starter Mounting Screw 7.3 N·m (65 in. lb.) Center Screw 5.0-6.0 N·m (44-54 in. lb.) Solenoid (Starter) Mounting Hardware 4.0-6.0 N·m (35-53 in. lb.) Nut, Positive (+) Brush Lead 8.0-11.0 N·m (71-97 in. lb.) Speed Control Bracket Fastener 10.7 N·m (95 in. lb.) into new holes 7.3 N·m (65 in. lb.) into used holes Starter Assembly Thru Bolt Inertia Drive Solenoid Shift 4.5-5.7 N·m (40-50 in. lb.) 5.6-9.0 N·m (49-79 in. lb.) Mounting Screw 23.8 N·m (211 in. lb.) Brush Holder Mounting Screw 2.5-3.3 N·m (22-29 in. lb.) Stator Mounting Screw 8.8 N·m (78 in. lb.) Valve Cover Stamped Steel Cover Fastener 13.6 N·m (120 in. lb.) Plastic Cover Fastener Hex Flange Pan Head 9.0 N·m (80 in. lb.) 6.2 N·m (55 in. lb.) CLEARANCE SPECIFICATIONS3 ZT710 ZT720 ZT730 ZT740 Camshaft End Play 0.06/0.40 mm (0.0024/0.0157 in.) Running Clearance 0.040/0.077 mm (0.0016/0.0030 in.) Bore I.D. New Max. Wear Limit 20.000/20.025 mm (0.7874/0.7884 in.) 20.038 mm (0.7889 in.) Bearing Surface O.D. New Max. Wear Limit 19.948/19.960 mm (0.7854/0.7858 in.) 19.945 mm (0.7852 in.) Connecting Rod Connecting Rod-to-Crankpin Running Clearance New Max. Wear Limit 0.037/0.083 mm (0.0015/0.0033 in.) 0.098 mm (0.0039 in.) Connecting Rod-to-Crankpin Side Clearance 0.261/0.67 mm (0.0102/0.0264 in.) Connecting Rod-to-Piston Pin Running Clearance 0.013/0.032 mm (0.0005/0.0013 in.) Piston Pin End I.D. New Max. Wear Limit 17.013/17.027 mm (0.6698/0.6704 in.) 17.040 mm (0.6709 in.) 3 Values are in Metric units. Values in parentheses are English equivalents. 5 Lubricate threads with engine oil prior to assembly. 10 Speciﬁ cations KohlerEngines.com 16 690 01 Rev. I CLEARANCE SPECIFICATIONS3 ZT710 ZT720 ZT730 ZT740 Crankcase Governor Cross Shaft Bore I.D. New Max. Wear Limit 8.025/8.075 mm (0.3159/0.3179 in.) 8.088 mm (0.3184 in.) Crankshaft End Play (free) 0.075/0.595 mm (0.0030/0.023 in.) Bore (in crankcase) New Max. Wear Limit 40.974/40.987 mm (1.6131/1.6137 in.) 41.000 mm (1.6142 in.) Bore (in oil pan) New 40.974/41.000 mm (1.6131/1.6142 in.) Crankshaft Bore (in oil pan)-to-Crankshaft Running Clearance New 0.039/0.087 mm (0.0015/0.0034 in.) Flywheel End Main Bearing Journal O.D. - New O

Source: manual:16_690_01_EN.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.