1988–1994 New Holland 345D, 445D, 545D, 250C & 260C Industrial Tractor Service & Repair Manual

This three-volume Ford/New Holland service manual covers 1988–1994 345D, 445D and 545D industrial tractor loaders, plus the 250C and 260C tractors. Its eleven sections cover system operation, repair, overhaul and diagnosis.

• Engine and cooling: Cylinder-head, crankshaft, piston and timing-gear repair, lubrication-system inspection, radiator removal, thermostat testing and water-pump overhaul.

• Diesel fuel system: DPA distributor-pump operation, pump removal and timing, throttle-linkage adjustment, injector testing and overhaul, and fuel-system troubleshooting.

• Transmission repair: Synchronized 4x4 and 8x8 power-reversing transmissions, torque-converter service, hydraulic clutch-pack inspection, modulator electrical tests and 6x4 manual-reversing overhaul.

• Rear axle, brakes and PTO: Differential-lock repair, final-drive overhaul, rear brake and linkage service, independent PTO clutch repair and pressure tests.

• Steering and front axle: Hydrostatic steering-motor overhaul, pump testing, system bleeding, two-wheel-drive axle service and Carraro front-wheel-drive axle repair.

• Tractor and loader hydraulics: Gear-pump overhaul, lift-cover and control-valve service, pressure and flow tests, loader-cylinder repair and self-leveling linkage adjustments.

• Electrical diagnosis: Starting and charging tests, alternator overhaul, safety-start circuits, cab wiring diagrams and power-reversing transmission troubleshooting flowcharts.

The overhaul procedures are suited to experienced tractor mechanics with splitting stands, precision measuring tools and hydraulic test equipment.

Engine Overhaul and Piston Differences

The engine section provides crankcase inspection data, crankshaft regrinding dimensions, bearing-clearance checks and component torque tables, including staged cylinder-head tightening instructions. Exploded component views, Valve Seat Dimensions drawings and lubrication-circuit diagrams support the internal inspections.

The 260C and 545D use autothermic headland pistons with an L-shaped top ring; conventional piston and ring arrangements are documented separately. The ring-installation notes warn that overlapping oil-ring expander ends can break a ring or damage the cylinder bore.

DPA Fuel System and Injector Service

The Sectional View of DPA Distributor Type Fuel Injection Pump explains the transfer pump, distributor and governor. Pump-drive timing illustrations distinguish the three-cylinder timing mark from the four-cylinder mark shown on the same gear.

Injector coverage includes opening-pressure, spray-pattern, seat-leakage and leak-back tests. Although European pump test conditions are explained, internal pump adjustments, testing and calibration are assigned to an authorized Lucas CAV service center using the applicable test plans.

Power-Reversing and Manual Transmissions

The 8x8 transmission adds torque-converter lock-up to the power-reversing system. Gearshift pattern charts and component sections document clutch-pack clearances, synchronizer inspection, shaft-bearing preload and solenoid-valve service; the 6x4 manual transmission has separate gearbox and mechanical-clutch procedures.

Electrical flowcharts address loss of drive, one-direction-only operation, lock-up faults and harsh engagement. These distinguish control-circuit faults from hydraulic or gear problems before unnecessary transmission dismantling.

Axles, Steering, Brakes and PTO

Carraro 710-19 front-axle coverage extends to planetary hubs, swivel-pin bearings, the differential, front drop box and transfer gearbox. Steering sections cover the hydrostatic motor, reservoir, pump and cylinders.

Rear-axle procedures include pinion and differential setup, brake-disc inspection and parking-brake linkage. Independent PTO Schematic drawings distinguish the drive arrangements for the manual and power-reversing transmissions, followed by clutch, brake and regulating-valve service.

Hydraulic Lift and Loader Controls

Tractor hydraulics distinguish engine-mounted and transmission-mounted gear pumps, with draft and position-control adjustments, remote-valve service and a Hydraulic System Schematic. Pressure and flow testing includes pump-efficiency and cavitation checks.

Loader coverage follows the reservoir, pump drive, lift and bucket cylinders, float function, return-to-dig controls and supporting frame. The dump-switch notes warn that using the disconnect pedal for inching can overheat and damage the transmission hydraulic clutches.

Raised loader arms and stored hydraulic pressure require the specified safety supports and pressure-relief precautions.

Wiring, Cab and Tractor Separation

Electrical references include the Instrumentation Circuit and Return-To-Dig Circuit, connector identification, harness routing, wire-color codes and diagnostic tables.

Cab work covers heater and pressurizer access, hinged and bonded glass, and cab removal. Tractor-separation procedures identify splitting stand set 201387 and the reconnection requirements. Accessory instructions include backup-alarm wiring, stabilizer kits and brake-pedal conversion. The FP 507 stabilizer instructions distinguish early and late mounting hardware for the 250C and 260C.

A Sample of Valve-Fit and Thermostat Data

These valve-fit and cooling figures are a small selection of the inspection and test data in the manual.

Intake-valve stem-to-guide clearance is 0.0010–0.0027 in; exhaust clearance is 0.0020–0.0037 in. These are guide-fit specifications, separate from valve-lash adjustment.

The thermostat inspection section gives an opening temperature of 168°F (76°C), alongside its water-bath test and replacement criteria.

PDF Search, Diagram Detail and Included Pages

Search and diagram navigation: Text search is available in parts of the PDF, primarily the transmission, axle, PTO and steering sections. Embedded bookmarks reach the main sections and many subsections. Small wiring labels require zooming; parts of the cab wiring diagram have faint or interrupted lines.

One printable, 838-page PDF combines Volume 1 (198 pages, including the cover), Volume 2 (378 pages) and Volume 3 (261 pages). One additional front page is already included in the total.