Caterpillar Forklift DP20N

Measure the resistance value of the relay coil at terminal 3 and 4

Is the measured resistance value within the standard range?

Measure the insulation resistance value between terminal 1 and terminal 2

Is the measured insulation resistance value more than the value listed in the table?

Apply a tester to terminal 1 and terminal 2

Apply a voltage of 12 V ON and OFF across terminal 3 and terminal 4

Does the relay activate to cause continuity between terminal 1 and terminal 2?

Control Valve Assembly Inspection after Disassembly

Check valves for burrs, scratches, dents and other surface defects.

(1) Check that all moving and sliding contact parts move smoothly.

(2) Check for clogged orifices.

(3) Replace springs if they are broken or bent. Measure the free length of springs.;

Difference in S.G. between any two cells is 0.020 or more?

Faulty components, loosely connected cord or corroded connection present?

Voltage and S.G. stabilize and have remained constant for more than 2 hours?

S.G. is more than 0.040 and a low S.G. is found in certain cells only?

Specific gravity reading and state of charge

Addition of distilled water is necessary every month or so?

Inspection of output time when starter switch is turned to ON

When a tester is applied to terminal 2 and terminal 1 and a voltage of 12 V is applied between terminal 3 and terminal 1, there is continuity between terminal 2 and terminal 1 for 15 seconds at room temperature. Replace the glow timer with a new one if it does not operate properly.

Inspection of output time when starter switch is turned to START

When a tester is applied to terminal 2 and terminal 1 and a voltage of 12 V is applied between terminal 4 and terminal 1, there is continuity between terminal 2 and terminal 1 for 5 seconds. Replace the glow timer with a new one if it does not operate properly.;

(1) Transmission oil level check

(a) Check the transmission fluid level with the level gauge.

(b) Start and run the engine at an idling speed for about 3 minutes, and then stop the engine.

(c) Wait for about 30 seconds after stopping the engine, and check the level.

(d) The checking procedure must be completed within 5 minutes after the engine has stopped.

(a) Warm up the engine to raise the temperature of the transmission oil.