Caterpillar 72H PIPELAYER - Maintenance | Semi-Annual

Battery - Inspect

• Open the battery access covers. The battery access covers are located on the left side of the machine outside the operator compartment.

• Tighten the battery retainers. Clean the top of the batteries with a clean cloth. Keep the terminals clean and coated with petroleum jelly. Install the terminal covers after you coat the terminals.

• Close the battery access covers.

Rollover Protective Structure (ROPS) - Inspect

• Inspect the Rollover Protective Structure (ROPS) for bolts that are loose or damaged.

• Replace any damaged bolts and any missing bolts with original replacement parts only. Tighten the 12 top bolts (1) to a torque of 800  100 N·m (590  74 lb ft). Tighten the four bottom bolts (2) to a torque of 460  60 N·m (340  45 lb ft).

• Apply oil to all bolt threads for the ROPS before you install the bolts. Improper bolt torque can result if you do not apply oil to the threads.

• Do not weld reinforcement plates to the ROPS in order to straighten the ROPS. Do not weld reinforcement plates to the ROPS in order to repair the ROPS.

• If the ROPS has any cracks in the welds, in the castings, or in any metal section, consult your Cat dealer for repairs.

Torque Converter Scavenge Screen - Clean

• When you change the transmission oil, clean the torque converter scavenge screen.

• Remove the bottom guard in order to gain access to the torque converter.

• Drain all fluids into a suitable container.

• Disconnect hose (1) from torque converter housing (2).

• Remove the torque converter scavenge screen from the torque converter housing.

• Wash the screen in a clean, nonflammable solvent.

• Install the screen in the torque converter housing.

• Connect hose (1) to torque converter housing (2).

• Install the bottom guard.

Transmission Breather - Clean/ Replace

• Open the front access door on the right side of the cab.

• The transmission breather is located on the bulk head bracket. Unscrew and remove the transmission breather.

• Clean the breather in clean, nonflammable solvent.

• Install the breather.

• Close the front access door on the right side of the cab.

Transmission Magnetic Screen - Clean

• When you change the transmission oil, clean the magnet assembly and the screen.

• Remove the bottom guard for access to the screen group.

• Remove the nuts which hold the cover to the housing.

• Remove the screen and the magnet assembly from the housing.

• Wash the screen and the magnet assembly in a clean, nonflammable solvent.

• Inspect the seal. If the seal is damaged, install a new seal.

• Install the screen and the magnet assembly.

• Install the cover on the screen housing.

• Install the bottom guard.

Transmission Oil - Change

• Drain The Oil

• Operate the machine in order to warm the power train oil. The machine must be level. Lower the attachments with slight down pressure.

• Remove the plug from the drain in the bevel gear case. Install a 4C-8563 Swivel into the valve. Clamp a hose to the swivel. A 25.4 mm (1 inch) pipe and hose can be used. Use a 25.4 mm (1 inch) pipe with 1-11 1/2 NPTF threads. Do not tighten the pipe.

• Turn the swivel or pipe clockwise in order to open the internal drain valve. Allow the oil to drain into a suitable container.

• Change the filter element.

• Remove the swivel or remove the pipe from the drain in the bevel gear case. The drain valve will close.

• Clean the oil drain plug and install the oil drain plug.

Transmission Oil Filter - Replace

• Remove transmission oil filter housing (1) from the transmission oil filter base (2).

• Remove the transmission oil filter element and properly dispose of the filter element.

• Clean the transmission oil filter housing with a clean cloth.

• Inspect the seal. If the seal is damaged, replace the seal.

• Install the new filter element into the oil filter housing. Then, install transmission oil filter housing (1) into base (2).

• Lubricate the threads of the transmission oil filter housing.

• Remove cap (3) from transmission oil filler tube (4).

• Fill the transmission system with oil.

Transmission Scavenge Screen - Clean

• When you change the transmission oil , clean the scavenge screen.