PLATE 4V1699 - Caterpillar

Pressurized System!Hydraulic accumulators contain gas and oil under high pressure. DO NOT disconnect lines or disassemble any component of a pressurized accumulator. All gas pre-charge must be removed from the accumulator as instructed by the service manual before servicing the accumulator or any accumulator component.Failure to follow the instructions and warnings could result in personal injury or death.Only use dry nitrogen gas to recharge accumulators. See your Cat dealer for special equipment and detailed information for accumulator service and charging.
Personal injury or death can result from sudden machine movement.Sudden movement of the machine can cause injury to persons on or near the machine.To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine.
Personal injury can result from rotating and moving parts. Stay clear of all rotating and moving parts.Never attempt adjustments while the machine is moving or the engine is running unless otherwise specified.The machine must be parked on a level surface and the engine stopped.Attach a "Do Not Operate" or similar warning tag to the start switch and controls before servicing, repairing, or making adjustments to the machine.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.Dispose of all fluids according to local regulations and mandates.
Specifications
Table 1
Model Accumulator Charging Pressure
735C, 745C, 740C Ejector Front brakes 8000 +200 kPa - 100 kPa (1160 + 30 psi - 15 psi)
At 21° C ( 70° F)
735C, 745C, 740C Ejector Rear Brakes 8000 200 kPa (1160 30 psi)
At 21° C ( 70° F) Introduction
This information includes the following test:
Service brake accumulators test and chargeMachine Preparation
Move the transmission control to the "N " position and move the parking brake control to the "ENGAGED" position. Shut off the engine.
Install the steering frame lock. Refer to Operation and Maintenance Manual, "Steering Frame Lock". Testing Procedure for the Accumulator Precharge Pressure
Illustration 1 g03774425
Location of front service brake accumulator
(1) Front service brake accumulator
Illustration 2 g03774457
Location of rear service brake accumulators
(2) Rear service brake accumulators Refer to Special Instruction, REHS5464, "Accumulator Discharging and Charging Procedures" for the required tooling, and the testing and charging procedure.Charging Procedure
Refer to Special Instruction, REHS5464, "Accumulator Discharging and Charging Procedures" for the required tooling, and the testing and charging procedure.