Terex TC 210/225 LC/NLC Service Manual — Wiring Diagrams

Check main pump pressure at the service port, reading pump 1 and pump 2 against 340 bar as listed on page 52. Run the pilot control pressure check at the same time so you know whether the fault sits in the pump or the pilot side. Keep clear of fittings under load; escaping oil is a burn and fire hazard.

Measure crawler travel motor pressure and compare it against the 350 bar listed on page 53, not the 340 bar pump figure, because the two values differ. If the travel side reads low while pump pressure is correct, move to the travel motor and crawler gear section starting on page 167 before you pull anything apart.

Measure crawler chain sag following the procedure on page 33 and adjust it to 160 to 190 mm. Tension is set through the guide wheel and hydraulic tension jack. When refitting the lubricating nipple, torque it to 40 to 60 Nm. The guide wheel and jack assembly weighs about 130 kg, so rig it properly.

Inspect the V-belt if it squeaks, then check that the fan actually runs before you blame the compressor. Work through the fault diagnosis for reduced or no cooling power in the air conditioning section starting on page 294. Wear protective clothing when you open the cooling circuit; the refrigerant handling rules are on page 19.

Test the slewing gear with a test run and judge it on three counts: thermal, acoustic and leakage. Check for particle residues before you sign it off. The slewing motor and slewing gear component assemblies are covered in the slewing mechanism section starting on page 124, so strip and inspect them there if the test fails.

Measure pressure at each pilot connection line and compare the readings against the values in the pilot control equipment fault diagnosis. Inspect the lines and fittings for leakage from a safe distance, because this is a high-pressure system. If the readings are off at the source, check the pilot control block, which is covered from page 221.