BobCat 753 – ENGINE – Removal And Installation

Put jackstands under the rear corners of the loader.

Raise the lift arms and install an approved lift arm support device. (See Installing Lift Arm Support Device on Page 10-20-1.)

Raise the operator cab. (See Raising The Operator Cab on Page 10-30-1.)

Drain the hydraulic reservoir. (See Replacing Hydraulic Fluid on Page 10-120-3.)

Disconnect the steering linkage. (See Linkage Removal And Installation on Page 50-110-3.)

Remove the battery from the loader. (See Removal And Installation on Page 60-20-1.)

Drain the engine coolant from the cooling system. (See RADIATOR on Page 70-50-1.)

Disconnect the engine harness connector (Item 1) [Figure 70-80-1] from the harness. If there is no connector, remove the harness from the engine.

Remove the air cleaner. (See Removal And Installation on Page 70-40-1.)

Remove the muffler. (See Removal And Installation on Page 70-30-1.)

Mark the four drive motor hoses (Item 1) [Figure 70-80-2] for correct installation.

Disconnect the four drive motor hoses (Item 1) [Figure 70-80-2] from the hydrostatic pump.

Disconnect the motor case drain hose (Item 2) [Figure 70-80-2] from the hydrostatic pump.

Disconnect the wire harness connector (Item 1) [Figure 70-80-3] from the fuel level sender on the fuel tank.

Disconnect the INLET hose (Item 1) [Figure 70-80-4] from the fitting on the hydraulic pump.

Disconnect the outlet tube line (Item 2) [Figure 70-80-4] to the main control valve, from the fitting on the hydraulic pump.

Remove the mounting bolt (Item 3) [Figure 70-80-4] and nut from the right front engine mount.

Remove the mounting bolt (Item 1) [Figure 70-80-5] and nut from the left front engine mount.

Installation: Tighten the mounting bolts to 70 ft.-lbs. (95 Nm) torque.

Disconnect the hand pump (Item 1) [Figure 70-80-6] from the fuel line connected to the fuel tank. Cap the fuel lines.

Disconnect the fuel return hose (Item 1) [Figure 70-80-7] from the injector.

Disconnect the radiator hoses (Item 1) [Figure 70-80-8] & [Figure 70-80-9] from the engine.

Remove the mounting bolt and nut (Item 1) [Figure 70-80-10] from the left rear engine mount.

Installation: Tighten the mounting bolt to 70 ft.-lbs. (95 Nm) torque.

Remove the mounting bolt and nut (Item 1) [Figure 70-80-11] from the right rear engine mount.

Installation: Tighten the mounting bolt to 70 ft.-lbs. (95 Nm) torque.

Disconnect the ground cable (Item 1) [Figure 70-80-12] from the loader frame.

Disconnect the rear light harness connectors (Item 1) [Figure 70-80-13] from the engine harness.

Remove the belt shield mounting bolts (Item 2) [Figure 70-80-13].

Installation: Tighten the mounting bolts to 25-28 ft.-lbs. (34-38 Nm) torque.

Remove the belt shield.

Disconnect the engine speed control rod (Item 3) [Figure 70-80-13] from the linkage.

Remove the coolant overflow bottle (Item 4) [Figure 70-80-13].

A tool needs to fabricated to be used in the removal procedure. This tool allows the engine/hydrostatic pump assembly to be lifted evenly for easier removal. Use the dimensions shown in [Figure 70-80-14] to make the engine removal tool.

Install the chain hoist on the eyelet (Item 1) [Figure 70-80-15] of the removal tool.

Fasten a chain to other end of the removal tool with two bolts as shown in [Figure 70-80-15].

Fasten securely one end of the chain to one of the lifting brackets on the engine [Figure 70-80-15].

Fasten securely the other end of the chain to the other lifting bracket on the engine [Figure 70-80-15].

NOTE: You may need to adjust the chain which fastens to the engine a couple of times to reach the correct lifting position.

Remove the engine/hydrostatic pump assembly from the loader.

Reverse the removal procedure to install the engine.