2001/04/09 Caterpillar

Load Haul Dump (LHD):

R1600 (S/N: 9EW)

The parking brake oil pressure switch information on page 20 has been revised. The revised information follows.

Illustration 1	g00787213
Parking Brake Oil Pressure Switch Location (1) Pressure switch (Parking brake oil) (2) Pressure switch (Parking brake oil) Remote lights (if equipped)

Pressure switch (1) is an input of the electronic transmission control. The electronic transmission control operates the parking brake alert indicator on the Caterpillar Monitoring System panel and can neutralize the transmission.

When the parking brake is disengaged and the parking brake oil pressure increases above approximately 2550 kPa (370 psi), switch (1) will open. The alert indicator for the parking brake on the Caterpillar Monitoring System panel will go out and the transmission will operate normally.

When the parking brake is engaged or the parking brake oil pressure drops below 1800 ± 105 kPa (261 ± 15 psi), switch (1) will close. This will cause the transmission to neutralize (if the machine is in first speed) and activate the alert indicator for the parking brake on the Caterpillar Monitoring System panel.

Illustration 2	g00787318
Rear of Operator's Station (3) Remote light, parking brake (if equipped)

Some machines that are equipped with the optional remote control system may also be equipped with an optional remote control parking light.

When the machine is operated by remote control and the parking brake is engaged or the parking brake oil pressure drops below 1800 ± 105 kPa (261 ± 15 psi), switch (2) will close. This will cause parking brake remote light (3) to illuminate.

While the parking brake is disengaged and when the oil pressure for the parking brake increases above approximately 2550 kPa (370 psi), switch (2) will open and remote light (3) will go out.