This 58-page Bolens 1502H, 1704H and TX2160 repair manual PDF (OEM #4041-1) covers the hydrostatic drive portion of these Iseki-built compact diesel tractors, including the F-HST and T-HST variants: front transmission, HST unit, and electric system. Chassis repair for the standard TX 1502 and TX1704 is a separate factory book (Form 553748-1). You get full wiring diagrams, an HST section that walks through the variable pump, charging circuit, and neutral, forward, and reverse mechanisms, plus a complete disassembly and reassembly chart for splitting the clutch housing from the front transmission. Service standards cover the engine and chassis, with tightening torque and a maintenance chart behind them. Set the M12 cylinder head bolts at 11 to 12 kg-m and the M10s at 7 to 8, and clean the fuel filter every 100 hours. No more guessing which wire runs to the safety switch. Bookmarked and readable on any device; prop a tablet on the fender and get your tractor mowing again.
What's Inside This Bolens TX Series Hydrostatic Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 1-11 | Introduction, External View, Specifications, Power Train Diagram, Assembly Drawings of the Power Train |
| Disassembly and Reassembly | 12-27 | Operation Chart for Disassembly and Reassembly |
| HST Construction and Handing | 28-39 | Construction and Operation (Functioning of Variable Type Pump and Fixed Type Motor, Charging Pump and Boost Circuit, Neutral Mechanism, Forward Mechanism, Reverse Mechanism) |
| Electric System | 40-41 | Wiring Diagrams |
| Service Standards & Other Information | 42-53 | Service Standards (Engine Proper, Chassis, Special Tools for Engine), Tightening Torque, Maintenance Chart, Lubricants and Capacities |
| Appendix | 54-58 | Reference Drawing for Attachment Installation, Drawing of Frpmt P.T.O Units, Piping System |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Battery | NS60 (12V - 45Ah) | p. 6 |
| Cylinder head bolt (M12 bolts) | 11 to 12 kg-m | p. 49 |
| Cylinder head bolt (M10 bolts) | 7 to 8 kg-m | p. 49 |
| Fuel filter replacement | Clean every 100 hours | p. 52 |
| Air cleaner replacement | Replace every 400 hours | p. 52 |
| Air cleaner cleaning | Clean every 100 hours | p. 52 |
| Clearance between safety switch and adjust bolt head | 2 mm | p. 47 |
| Compression Pressure | 32 kg/cm2 | p. 42 |
| HST Maximum Operating Pressure | 250 kg/cm2 | p. 30 |
| Boost Circuit Pressure | 5 kg/cm2 | p. 30 |
| Cylinder Head Bolt Torque (M12) | 11 to 12 kg-m | p. 49 |
| Front Tire Air Pressure (4WD) | 2.0 kg/cm2 | p. 47 |
Bolens TX Series Hydrostatic Common Problems This Manual Covers
Bolens 1502H hydraulic lift weak, three-point hitch won't raise or drops slowly under load
Check hydraulic oil level first; low oil pulls air into the charge circuit and kills lift power. Test boost circuit pressure against the 5 kg/cm2 (0.5 MPa) spec on page 30; a low reading means the charging pump is not feeding the circuit. Inspect suction fittings for air leaks before condemning the pump.
Manual Section: HST Construction and Handing p. 30Diesel hard to start or won't fire after sitting in the barn all winter
Verify the fuel shutoff is open, then crack an injector line while cranking to confirm delivery. Bleed air from the filter housing through to the injection pump. Clean the fuel filter; the maintenance chart calls for cleaning every 100 hours. If it still drags, test compression against the 32 kg/cm2 at 280 rpm standard on page 42.
Manual Section: Service Standards & Other Information p. 42Starter does not crank, solenoid clicks once with the key held on
Check the battery first; the spec is an NS60 12 volt 45 Ah unit, and a weak one clicks the solenoid without spinning the starter. Verify the brake and PTO interlocks are satisfied, then set the safety switch gap to 2 mm between the switch and adjust bolt head. Chase loose grounds with the wiring diagram on page 40.
Manual Section: Electric System p. 40Hydrostatic drive creeps forward in neutral or whines and loses power on hills
Set the tractor on stands and verify the neutral linkage returns the trunnion to center; a misadjusted neutral mechanism makes the machine creep. Check charge oil level and condition, then confirm relief operation against the 250 kg/cm2 (25 MPa) maximum operating pressure on page 30. Drain and replace milky or burnt-smelling oil before any teardown.
Manual Section: HST Construction and Handing p. 28Engine lugs down, blows black smoke, and loses rpm under mower load
Remove the air cleaner element and inspect it before touching the fuel system; a plugged element chokes a diesel into black smoke. Clean the element every 100 hours and replace it every 400 hours, following the maintenance chart on page 52. Check the fuel filter at the same interval and look for kinked or weeping fuel lines.
Manual Section: Service Standards & Other Information p. 52Frequently Asked Questions
What are the torque specifications for the cylinder head bolts on the Bolens 1502H and 1704H?
The cylinder head bolts for the engine require a tightening torque of 11 to 12 kg-m for the M12 bolts and 7 to 8 kg-m for the M10 bolts. p. 49
What is the recommended engine oil capacity for the Bolens 1502H and 1704H?
The engine oil capacity is 3.0 liters when filled to the upper limit, with 0.5 liters excluded for the oil filter, and 1.8 liters at the lower limit. p. 44
What is the standard valve clearance for the engine?
The standard valve clearance for both intake and exhaust valves is 0.25 mm when the engine is cold. p. 42
What is the injection timing for the engine?
The injection timing is set to 19 degrees B.T.D.C. when started at the smoke set position. p. 42
What is the required transmission oil capacity?
The transmission gear case requires 16 liters of Donax TD oil. p. 50
How is this Bolens 1502H Repair Manual delivered?
You get a 58-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Are there any print restrictions on this Bolens 1502H manual?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
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