This Cat truck hydraulic clutch service manual, publication UENR0733, covers systems operation, disassembly and assembly, and specifications for the clutch on Caterpillar CT610 and CT630 vocational trucks. It explains how the master cylinder, clutch servo and air assist work together to disengage the clutch. The servo is bolted to the transmission clutch housing and pushes the release fork through a push rod, so a firm pedal depends on a properly bled, leak-free system.
Official document details
| Brand | Cat Trucks (Caterpillar) |
| Model coverage | CT610, CT630 |
| System / Group | Hydraulic Clutch |
| Publication no. | UENR0733 |
| Year | June 2010 |
| Pages | 29 |
| File size | 2.0 MB |
| Format | |
| Language | English |
What the Cat truck hydraulic clutch manual covers
- System description: clutch pedal, master cylinder, reservoir, clutch servo, hydraulic hose and bleeder valve
- How the servo regulates air at 3 bar (44 psi) to help disengage the clutch
- Remove and install procedures for the reservoir, clutch master cylinder, clutch servo and clutch pedal
- Hydraulic fluid changing and checking the fluid level
- Reverse vacuum (recommended) and reverse pressure (optional) bleeding procedures
- Diagnosis and troubleshooting of slippage, drag and pedal-effort faults
- Fluid specifications (DOT 3 or DOT 4 brake fluid, 0.49 L / 16.6 oz) and torque values
Applicable truck models
The document targets the Caterpillar-branded CT610 and CT630, the vocational trucks Caterpillar built on the International platform. Hydraulic hoses are compatible with DOT 3 and DOT 4 brake fluid and should be inspected for wear at the crimped fittings and adapter connections. Reverse-vacuum bleeding runs with shop air set between 4.8 bar (70 psi) and 10.3 bar (150 psi), drawing fluid until clear, bubble-free fluid flows through the clear vacuum tube. On loss of air pressure the servo still actuates the clutch, though with increased pedal effort. Confirm model and serial coverage through the Caterpillar official website before ordering clutch parts.
Who needs this Cat truck hydraulic clutch manual
Drivetrain technicians and clutch specialists use UENR0733 to bleed the system correctly and diagnose servo, master cylinder and bleeder valve faults, then torque the servo bleeder valve to 5.4 N•m (4 lbf-ft) on reassembly. The full PDF is available in the DiagTechPro manuals library, where a free account is required to download.
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