Bolens Iseki G152/G154 & G172/G174 Tractor Service Manual (TX1300/TX1500), 1970s–1980s

This Bolens Iseki service and repair manual covers the listed 1970s–1980s G152, G154, G172, and G174 tractors and their TX1300/TX1300F and TX1500/TX1500F equivalents. The engine sections also include KE55 procedures and TX1000/TX1000F reference data.

PDF Bookmarks and Wiring Detail

Search, navigation, and diagrams: Manual text is not searchable. Seven embedded bookmarks provide access to selected sections, including engine service, tractor disassembly, transmission, and assembly adjustments. Small wiring labels are readable with zoom; the main tractor wiring diagram is sideways in the file.

One printable, English-language PDF contains 127 pages: 125 pages of manual content, including the rotary hoe section, plus a cover and one explanatory page about omitted original blank pages.

Diesel Engine, Drivetrain, and Rotary Hoe Service

The following selected contents outline the main workshop coverage. Further topics include tire-tread adjustment and ridger installation.

• Engine and cooling: Cylinder-head and crankcase disassembly, valve inspection, oil-pump clearance checks, radiator removal, and fan-belt adjustment.

• Fuel injection: Injection-timing adjustment with shims, nozzle pressure and spray tests, governor inspection, and fuel-system bleeding.

• Clutch and transmission: Step-by-step disassembly procedures, clutch adjustment, differential assembly, drive-pinion backlash adjustment, and power take-off shaft service.

• Axles, brakes, and steering: Front axle and drive-shaft removal, brake-shoe centering, pedal adjustment, steering linkage service, and toe-in adjustment.

• Hydraulic lift: Gear-pump and piping removal, lift-cylinder disassembly, lift-arm alignment, control-valve return adjustment, and bleeding.

• Electrical diagnosis: Starting-circuit checks, starter no-load testing, alternator performance tests, regulator checks, and tractor wiring diagrams.

• Rotary hoes: Side-drive and center-drive installation, tilling-shaft removal, blade arrangements, lubrication, and drivetrain sectional views.

Suited to mechanics experienced in engine measurement and tractor disassembly, with access to a press, lifting equipment, and electrical test instruments.

Engine Inspection and Reassembly

Engine sectional views and the lubrication-flow diagram accompany inspection standards for cylinders, pistons, rings, crankshaft journals, bearings, and valve components. These references let a mechanic compare measured wear with the manual’s standard dimensions and service limits when assessing repair work.

Engine-specific tooling: The KE55 and KE70 use pressed-in piston pins, while the KE75 uses a full-floating arrangement. The manual identifies piston-pin tool MD998130, the separate KE55 guide ST332150, and main-bearing installer ST33210-0.

Assembly notes address piston-pin support, press handling, and main-bearing oil-hole alignment. Periodic maintenance and lubrication charts provide the service schedule alongside the internal engine procedures.

Injection Tests and Electrical Fault Isolation

Fuel-system depth: The cross section of the nozzle holder supports the pressure, spray-pattern, and afterdripping checks. Delivery-valve sealing and plunger oil-tightness tests are also described. Injection-pump internal service requires specialist skill and suitable test facilities; the manual expressly cautions against routine pump disassembly.

Starting and charging: The starter symptom-and-cause chart links current draw and motor speed to possible electrical or mechanical faults. Together with the starting-circuit checks, it supports diagnosis before condemning the starter itself.

Alternator and regulator circuit diagrams complement the main tractor wiring diagram, grounding-position list, and harness-routing illustration. A specific electrical caution identifies the risk of alternator diode damage from high-voltage testing.

Transmission Assembly and Implement Setup

Power train diagrams distinguish the two-wheel-drive and four-wheel-drive arrangements. The assembly text explains matched drive-pinion and ring-gear pairs, differential shimming, shift mechanism checks, and front-drive universal-joint alignment.

The transmission case also serves as the hydraulic reservoir, making cleanliness relevant to both systems. Its assembly notes warn against prying or heavy hammering on the aluminum case, which risks case damage.

Rotary hoe coverage: The attachment section distinguishes SR1000CD, SR1100CD, and SR1200CD side-drive units from SR1000N, SR1100N, and SR1200N center-drive units. Blade-layout illustrations cover flat tilling, hilling, and standard tilling; separate instructions address puddling rotors.

For the TX1300F through serial number 5000, the installation section identifies a different lock-stay mounting arrangement. This is an attachment-installation distinction, not a limit on the entire manual’s coverage.

Follow the manual’s safety precautions for supporting separated tractor assemblies and working around the rotary hoe.

Examples from the Engine Service Tables

The engine service table lists compression pressure at 455 psi (32 kg/cm²) at 2,800 rpm, with a cylinder-to-cylinder difference limit of 35 psi (2.5 kg/cm²). Cold intake and exhaust valve clearance is 0.014 in (0.35 mm).

Cylinder-head bolt torque is separated by engine: 80–87 ft-lb for the KE55 and 94–101 ft-lb for the KE70 and KE75. The accompanying assembly section provides the tightening sequence.