JCB 444 Engine Service Manual Wiring Diagrams

Before carrying out repairs, it is necessary to diagnose the engine. dieselmax 444 Engine diagnostics reveals the degree of deviation from the standards provided by the manufacturer and the expediency of dismantling the engine from the equipment.

Diagnostics of the DIESELMAX JCB 444 engine is one of the main procedures. A correct diagnosis of a malfunction allows you to avoid excessive expenses during repairs. When diagnosing, a visual inspection of the engine is carried out for leakage of operating oils and liquids, measurement of compression, crankcase gas pressure, oil pressure, turbine boost pressure, exhaust gas temperature and color. As well as, if possible, computer diagnostics. Based on the results of the diagnostics, a decision is made to carry out repairs on the spot, partial disassembly. Or dismantling the engine for repair in a workshop.

General Information Download

Routine Maintenance Download

Systems Description Download

Fault Finding Download

Test Procedures Download

Fuel System Download

Cooling System Download

Lubrication System Download

Electrical System Download

Induction and Exhaust System Download

Base Engine Download

JCB has been known worldwide for over 60 years as a manufacturer of heavy construction equipment and premium diesel engines. The company's power plants are distinguished by high quality workmanship, reliability and durability.

This is the dieselmax 444 engine. This is an in-line 4-cylinder engine with a volume of 4.4 liters, a power range of 74-125 liters. with., with high torque at low speeds. The Gisibi 3cx engine is water-cooled and has direct fuel injection. The jcb perkins engine also has a cast iron sleeveless cylinder block which creates a solid construction.

The JCB444 engine is a four-cylinder in-line 4.4-liter displacement, water-cooled and direct fuel injection. There are several versions: aspirated with a capacity of 74 and 84 hp. and turbocharged 100 and 125 hp. (the latter is liquid-cooled supercharged)

Since the beginning of 2005, this engine has been equipped with all backhoe loaders of models: 2CX, 3CX, 4CX, loaders with side swivel, as well as forklifts and small front loaders.

Massive cast iron sleeveless cylinder block and lower crankshaft main bearing cover made in the form of a solid massive plate create a very rigid and durable structure designed for many years of operation. But even with such a rigid and high-precision design, the cylinder block has up to 2 repairs with an increase of 0.5 mm and 1 mm and the possibility of sleeves for the nominal size. The cylinder head, with four valves per cylinder, is also made of cast iron.

The combustion chamber in the bottom of the piston is made in the form of a torus, which ensures optimal filling of the chamber and efficient combustion of the mixture. The piston has two compression rings and one oil scraper ring.

Connecting rods "broken", liners without locks.

The gas distribution system is with a lower camshaft and four valves per cylinder. Each pair of valves - intake and exhaust - is driven by one rocker arm through a T-shaped pusher.

The fuel system is equipped with a single-plunger high-pressure mechanical pump and mechanical injectors.

Of the design features, it can be noted that it is impossible to perform such a simple operation as removing the injection pump without a specialized tool.

• Increased oil consumption.
• Engine breather (ejection of oil, or whitish smoke from the engine breather).
• Decrease in engine power up to a stop.
• Increasing or lowering the levels of oils or operating fluids.
• Increased engine smoke.
• Increased fuel consumption.
• Difficult start.
• Extraneous sounds during engine operation.
• Oil pressure drop.

Causes of occurrence:

• Natural wear and tear during operation.
• Low quality fuel.
• Burnout, cracks in the bottom of the pistons.
• The occurrence of rings.
• Oil "starvation" of components and parts.
• Worn valve stem seals.
• Camshaft cam wear.
• Increase in gaps of mating surfaces.
• Oil pressure drop.