JCB fan blades and viscous coupling

Categories

07/10/2026 23

JCB JS200–JS260 Monitor Messages: What They Mean and What to Check

On JCB JS200, JS210, JS220, JS240 and JS260 tracked excavators with the AMS control system, the monitor in the cab shows the working mode, the time, gauges for oil temperature, coolant temperature and fuel level, and warnings in the message line. Each message first of all points to a real problem: low fuel or coolant, a blocked filter, overheating. But if a message stays on after the cause has been put right, the sensor, wiring or controller is at fault. Below is what each message means and what to check, based on Section C of JCB service manual 9803/6400.

07/10/2026 31

JCB JS200–JS260 Track Tension: How to Check the Sag and Adjust the Tracks

Track tension on the JCB JS200, JS210, JS220, JS240 and JS260 tracked excavators should be checked every shift. With the track raised off the ground, the gap between the underside of the track frame and the top of the track shoe at the fourth bottom roller from the front should be 275–295 mm on hard ground and 320–340 mm on soft sand and sticky clay. Tension is adjusted with grease through the valve on the track adjuster cylinder. The procedure below follows Section 3 of JCB service manual 9803/6400.

07/10/2026 19

JCB 3CX and 4CX Dipper Ram Creep: Causes, Ram Creep Tests and Repair

If the dipper of a JCB 3CX or 4CX backhoe loader drops on its own under load, there are three possible causes: a leaking piston seal in the ram, spool leakage in the excavator valve section, or a leaking auxiliary relief valve (ARV) in that section. The JCB service manual gives a test procedure that identifies the culprit before the ram is removed and stripped. Below are the test sequence, the permitted creep and the repair rules from Section E of service manual 9803/3290.

07/10/2026 23

JCB 3CX and 4CX Hydraulic Oil: HP32 or HP46, System Capacity and Changing the Oil

For the hydraulic system of JCB 3CX and 4CX backhoe loaders, the JCB service manual recommends ISO VG32 oil — JCB Hydraulic Fluid HP32 — at air temperatures below +38 °C. The more viscous ISO VG46, JCB High Performance Hydraulic Oil, is for air temperatures above +38 °C only. Machines with Advanced EasyControl joysticks need a separate all-season HV class oil, JCB Multigrade Anti Shear. The hydraulic system holds approximately 130 litres. The oil is changed every 2000 hours and the filter at every 500-hour service.

07/10/2026 29

JCB 3CX and 4CX Antifreeze: Which Coolant to Use, How Much and How to Change It

On JCB 3CX and 4CX backhoe loaders with the JCB Dieselmax engine, the coolant is renewed every two years, at the 2000-hour service. The cooling system holds 18.5 litres. The JCB service manual calls for an ethylene glycol antifreeze to ASTM D6210 with corrosion inhibitors and rules out organic acid technology (OAT) products. The standard mix is 50%, which gives protection down to −40 °C. Below we cover choosing, checking and changing the antifreeze as described in Section 3 of JCB service manual 9803/3290.

Fan blades, a viscous coupling and the fan pulley bearing. This subcategory has fans for JCB SB engines, a JS excavator fan, a Perkins engine fan, a complete fan assembly (123/15797) and 21 and 22 inch fans.

When choosing a fan, compare the diameter, number of blades and mounting holes: for example fan 30/925525 is 22 inch (558 mm) with 9 blades. For SB engine fans, the letter in the name shows which engine version the part belongs to. The viscous coupling (30/926572) adjusts fan speed to engine temperature; when it fails, the fan runs constantly at full speed or too slowly.

Drive belts are in the belts category, radiators in radiators, and pumps driven by the same belt in water pumps. One level up is the cooling system category.

By production type, this category holds: original — 3, aftermarket — 11. Prices are given on request: press «Request price» and state the part number, fan diameter and chassis number (VIN).

Default Name Model

30/925525

Fan 22" (558 mm), 9 blades 30/925525 JCB 3CX/4CX, aftermarket

In stock

0.00 ₺

123/05911

Fan blade 123/05911 Perkins, aftermarket

In stock

0.00 ₺

30/926573

Fan blade SB 30/926573 JCB 444, aftermarket

In stock

0.00 ₺

30/926573

Fan blade SB 30/926573 JCB 444, genuine

In stock

0.00 ₺

30/925526

Fan blade SB, version 2 30/925526 JCB 444, aftermarket

In stock

0.00 ₺

02/200010

Fan pulley bearing 02/200010 Perkins, aftermarket

In stock

0.00 ₺

30/926572

Viscous fan coupling 30/926572 JCB 3CX/4CX, aftermarket

In stock

0.00 ₺

332/C9629

Fan 21 in 332/C9629 JCB 3CX/4CX, aftermarket

In stock

0.00 ₺

123/15797

Fan assembly SB 123/15797 JCB 444, genuine

In stock

0.00 ₺

2485C520

Fan blade 2485C520 Perkins, aftermarket

In stock

0.00 ₺

262/36800

Fan blade 262/36800 JCB, aftermarket

In stock

0.00 ₺

30/926761

Fan blade 30/926761 JCB JS, genuine

In stock

0.00 ₺

30/926950

Fan blade 30/926950 JCB 3CX/4CX, aftermarket

In stock

0.00 ₺

14670742

Fan clutch, aftermarket

In stock

0.00 ₺

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Fans and fan blades