Diesel fuel injection is the fussiest system on these compact tractors, and this 127-page manual starts there, then widens to the clutch, transmission, front axle, brakes, steering and rotary hoe on eight Bolens / Iseki G-series and TX variants. Engine teardown fills much of this Bolens / Iseki G152, G154, G172, G174, TX1300, TX1300F, TX1500, TX1500F service and repair manual PDF, and a power train diagram traces drive from the universal joint through the bevel pinion to the side gear case. Wiring diagrams let you trace the electrical system wire by wire, and the service data section lists torque values and every part that needs sealing agent. Set nozzle injection start pressure to 1707-1849 PSI (120-130 kg/cm²) and time injection at 25 degrees BTDC. Guess wrong and you pay for a second teardown. Print the bookmarked pages and let them collect grease on the bench while your tractor gets back in the field before the weather turns.
What's Inside This Bolens / Iseki G152, G154, G172, G174 Manual
| System | Pages | Key Topics |
|---|---|---|
| Names of Main Components | 4 | Front Axle Case, Radiator, Cooling Fan, Front Wheel Drive Shaft, Crankshaft, Transmission Gears |
| Dimensions and Specifications | 5-6 | Overall Dimensions, Engine Specifications, Tractor Speeds, Steering System, Brake System, Hydraulic System |
| Periodic Maintenance Chart | 7-8 | Engine, Tractor |
| Lubrication | 9 | Lubrication Chart |
| Service Data | 10-22 | Service Standards, Special Tools, Tightening Torque Chart, Stud Bolt List, List of Parts Requiring Sealing Agent |
| Power Train Diagram | 23-24 | Universal Joint, Bevel Pinion, Top Shaft, Bevel Gear, Side Gear Case, Rotary Pipe |
| Construction and Service of the Engine | 25-50 | Sectional View of Engine |
| Disassembly of the Tractor | 51-85 | Bonnet and Other Components in the Front Section, Driver's Seat and Rear Fenders, Radiator and Air Cleaner, Muffler, Fuel Tank, Battery, Throttle Lever, Tank Base and Stop Plate |
| Assembly and Adjustment of the Tractor | 86-107 | Clutch, Transmission, Front Drive, Brake, Hydraulic System, Engine Accessories, Steering System, Tire Tread Adjustment |
| Rotary Hoe | 108-127 | Rotary Hoe Specifications, Rotary Hoe Installation, Tilling Blade Arrangement |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Glow plug resistance | 1-1.2 ohm | p. 19 |
| Fuel filter replacement interval | every 400 hours | p. 44 |
| Fuel injection timing | 25 degrees BTDC | p. 17 |
| Nozzle injection start pressure | 1707-1849 PSI (120-130 kg/cm²) | p. 17 |
| Radiator cushion rubber thickness | 8 mm (0.31 in) | p. 101 |
| Radiator fuel capacity | 4.2 lit (0.92 gal) | p. 101 |
| Cylinder head bolt torque (KE55) | 80-87 ft-lbs (11-12 kg-m) | p. 22 |
| Cylinder head bolt torque (KE70 and KE75) | 94-101 ft-lbs (13-14 kg-m) | p. 22 |
| Nozzle holder mounting bolt torque | 11-15 ft-lbs (1.5-2 kg-m) | p. 20 |
| Glow plug rated voltage | 10.5V | p. 19 |
| Water pump belt deflection | 10-12 mm (0.39-0.47 in) | p. 46 |
| Cylinder Head Bolt Tightening Torque (KE55) | 80-87 ft-lbs | p. 20 |
Bolens / Iseki G152, G154, G172, G174 Common Problems This Manual Covers
Bolens/Iseki G152 TX1300 glow plug not heating, diesel engine hard to start on cold mornings
Test each glow plug following the electrical troubleshooting on page 49. Measure resistance at normal temperature against 1-1.2 ohm and confirm the plug is rated 10.5V, per page 19. Replace any plug reading open or out of range, then torque it to 11-15 ft-lbs (1.5-2 kg-m) from page 20 so you are back in the field.
Manual Section: Electrical System Troubleshooting p. 49Fuel injection nozzle start pressure reading low or uneven on the nozzle tester
Remove the nozzle holder and pop test it on a tester. Verify injection start pressure against 1707-1849 psi (120-130 kg/cm²) listed on page 17. Adjust shim thickness per page 45: each 0.1 mm (0.0039 in) moves pressure about 142.3 psi. Reinstall and torque the nozzle holder mounting bolts to 11-15 ft-lbs.
Manual Section: Fuel System Troubleshooting p. 45Injection pump plunger or delivery valve failing to hold pressure on the oil-tight tester
Test the plunger and barrel on an oil-tight tester following page 44, raising pressure to 300 kg/cm² (4267.7 psi). Check the delivery valve and seat assembled at 150 kg/cm² (2133.4 psi). Replace parts that bleed down. On reinstall, verify the cam base circle to gear case face dimension is 75.95 to 76.05 mm and timing is 25 degrees BTDC.
Manual Section: Fuel System Troubleshooting p. 44Fuel filter assembly past its service interval, restricting fuel flow to the injection pump
Replace the fuel filter assembly every 400 hours of operation as page 46 specifies, and do not stretch that interval into planting season. Work through the fuel system troubleshooting on page 44, which covers the injection pump, nozzle, governor and fuel filter, to rule out the filter before you pull anything bigger.
Manual Section: Fuel System Troubleshooting p. 44Water pump belt loose or slipping on the crankshaft pulley, engine running hot
Check belt tension by pressing the belt midway between the water pump pulley and crankshaft pulley, as shown on page 46. Deflection must measure 10-12 mm (0.39-0.47 in). Adjust tension until it falls inside that range, and recheck after the first hours of field work so a slack belt does not cost you a day of haying.
Manual Section: Construction and Service of the Engine p. 46Engine oil drain plug seeping oil at the crankcase after an oil change
Clean the drain plug and its seat, then torque the plug to 36-43 ft-lbs (5-6 kg-m) per page 22. Do not crank it past spec to stop a drip. Torque the oil filter to only 8-9 ft-lbs (1.1-1.3 kg-m) on the same page, and verify the level before heading back out to the field.
Manual Section: Service Data p. 22Frequently Asked Questions
What are the torque specifications for the cylinder head bolts on a Bolens G152, G154, G172, or G174?
The tightening torque for the cylinder head bolts on the KE55 engine is 80-87 ft-lbs (11-12 kg-m), and for the KE70 and KE75 engines, it is 94-101 ft-lbs (13-14 kg-m). p. 20
What are the replacement specifications for the glow plugs on the Bolens G152, G154, G172, G174?
The glow plug is a sheath type with a rated voltage of 10.5V and a resistance of 1-1.2 ohm at normal temperature. p. 19
What is the engine oil change interval for the Bolens G152, G154, G172, G174 tractors?
The engine oil should be changed every 100 hours of operation. The oil level must be maintained within the specified range on the level gauge. p. 7
What is the correct valve clearance for the engine on the Bolens G152, G154, G172, G174?
The valve clearance for both intake and exhaust valves on a cold engine is 0.014 in (0.35 mm). p. 11
What is the fuel injection timing for the engine on the Bolens G152, G154, G172, G174?
The fuel injection timing is set to 25 degrees Before Top Dead Center (BTDC). p. 11
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