MH3022, MH3024 and MH3026 Material Handlers Hydraulic System Caterpillar

Brake Disc Wear - Measure

Usage:

Show/hide table

Table 1
"Brake Disc Wear - Measure"
Date:		Machine Serial Number:
Model	Axle (Type)	Number of Clutch Discs	Piston Stroke With New Clutch Discs	Limit Value of Piston Stroke (X) at Maximum Wear
MH3022 MH3024 MH3026	MS-E 3070	7	1.2 to 1.8 mm	6.5 mm
MH3022 MH3024 MH3026	MT-E 3070	7	1.2 to 1.8 mm	6.5 mm
Actual

This procedure will determine if there is a need to replace the brake discs.

Show/hide table

Table 2
Required Tools
Item	Qty	Part Number	Description
1	1	8T-5096	Dial Indicator Group

Clear all personnel from the machine and from the area around the machine.
Start the engine.
Show/hide table

Illustration 1 g02449876

Engine speed dial
Set the engine speed dial at "10".
Lower the left console.
Position the machine on level ground. Check the visibility and adjust the mirrors for the best vision close to the machine.
Fully depress the service brake pedal until the service brake pedal locks mechanically.
Lower the stabilizers and blade tip.
Fully extend the bucket cylinder and place the bucket on the ground.
Stop the engine.
Release the pressure in the hydraulic system.
Note: Refer to Testing and Adjusting, "System Pressure - Release".
Raise the left console.

Show/hide table

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.

Show/hide table

Position the wheel so that oil fill/drain plug (1) is on the left side of the wheel. Refer to Illustration 2.

Show/hide table

NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose of all fluids according to local regulations and mandates.

Carefully remove oil fill/drain plug (1).
Show/hide table

Illustration 3 g03739494

Wheel Brake (Section View)
(2) Dial indicator
(3) Plug hole
(4) Indicator contact point
(5) Internal gear
(6) Piston
When the service brakes are not applied, piston (6) is in contact with internal gear (5) by the compression spring. Insert indicator contact point (4), that is the appropriate length, through plug hole (3) and into contact with piston (6). Set the indicator dial to zero. Refer to Illustration 1.
Show/hide table

Illustration 4 g02419856

Wheel Brake (Section View)
(X) Piston stroke
Apply the service brakes and determine piston stroke (X) via the dial indicator movement.
Refer to Table 1 in order to determine if the clutch discs need to be replaced. If Dimension (X) exceeds the value that is shown in Table 1, replace the clutch discs.
Remove dial indicator (2).
Use a new O-Ring seal and reinstall oil fill/drain plug (1). Tighten the oil fill/drain plug to a torque of 50 N·m (37 lb ft).