Bulbs: H1, H3, H7, P21W, BA15s

Categories

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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.

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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.

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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.

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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.

Bulbs: work lamp bulbs (H1, H3 and H7; 12 V and 24 V), stop and indicator bulbs (P21W, P21/5W, amber PY21W), side lamp bulbs (BA9s and BA15s bases), number plate and instrument panel bulbs. When choosing, compare the bulb type, base, voltage and wattage given in the name.

The base decides whether a bulb fits the holder. BA15s has one contact and pins at the same level (P21W, R5W); BAY15d has two contacts and pins at different heights, so the twin-filament bulb works as both stop and tail light (P21/5W). On BAU15s the pins are offset around the base, so a yellow PY21W cannot be fitted by mistake into a white P21W holder. W5W has a glass wedge base W2.1x9.5d, C5W is a festoon bulb with SV8.5 caps, and H3 connects through a PK22s lead. The bulb voltage must match the machine: a 12 V bulb in a 24 V system burns out at once, a 24 V bulb in a 12 V system glows dimly. T4W, R5W and P21/5W are available in both voltages.

Lamps and lenses are in the lighting section. This section is part of the electrical system category.

All items in this category are aftermarket. To get a price, use «Request price» on the product page and include the bulb type, voltage and quantity.

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