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• Use the correct tools for the job. • Keep the tools clean and in good condition. • Always use HYSTER APPROVED parts when making repairs. Replacement parts must meet or exceed the specifications of the original equipment manufacturer. • Make sure all nuts, bolts, snap rings, and other fastening devices are removed before using force to remove parts.
1800 SRM 1037 Description and Operation General The main components of the parking brake system This parking brake is for use on hydraulic brake sys- are: tems only. • Parking brake switch • Solenoid valve • Parking brake caliper Description and Operation The parking brake system uses a disc brake that is installed at the rear of the differential housing.
Parking Brake Caliper Repair 1800 SRM 1037 Parking Brake Caliper Repair RELEASE BRAKE MANUALLY 3. Remove the cotter pin from the stud nut. Tighten the nut against the spring cap and continue Hydraulic Pressure Available tightening to manually retract the piston and lining from the disc.
1800 SRM 1037 Parking Brake Caliper Repair parts. Isopropyl alcohol can be used for this CAUTION purpose. Use a wooden tool and vise with soft jaws in 1. Use solvent cleaners to clean all metal parts that the following steps to prevent damage to the have a ground or polished surface.
Use Figure 4. Disc Maximum Wear Limits of parts not approved by Hyster can cause Table 1. Disc Wear Limits damage and loss of braking which could result in serious personal injury.
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1800 SRM 1037 Parking Brake Caliper Repair c. Linings fastened with screws: ® Apply Loctite 271, or equivalent, to the threads of the screws. Attach the linings to the piston and the housing. Torque the screws to 5 to 6 N•m (44 to 53 lbf in) 5.
WARNING when you apply the brake pedal. Use only the type of hydraulic fluid specified by Hyster. Do not use or mix different types 4. Check for fluid leaks. of hydraulic fluid. The wrong hydraulic fluid can damage rubber parts of the caliper and can cause damage, loss of braking, and serious per- sonal injury.
1800 SRM 1037 Parking Brake Caliper Repair ADJUST CAUTION If the brake has too little clearance, it may not release properly. This will cause the linings to drag and damage to both linings and the disc. CAUTION If there is too much clearance, the clamping Figure 7.
Troubleshooting 1800 SRM 1037 Specifications Table 2. Torque Requirements Torque Component Lining snap fastener screws 5 to 6 N•m (44 to 53 lbf in) Bleeder screws 20 to 27 N•m (15 to 20 lbf ft) Table 3. Wear Limits Component Replace Disc Wear exceeds maximum of 1.524 mm (0.06 in.)
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1800 SRM 1037 Troubleshooting PROBLEM POSSIBLE CAUSE PROCEDURE OR ACTION The parking brake will not The springs in the brake caliper are Replace springs. apply. damaged. The piston is cocked in the bore. Replace piston if large end diameter is less than 101.47 mm (3.995 in.) or the small end is less than 63.37 mm Replace housing if the (2.495 in.).
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Troubleshooting 1800 SRM 1037 PROBLEM POSSIBLE CAUSE PROCEDURE OR ACTION Damaged linings or disc. Brake is not properly adjusted. Lin- Replace parts as Adjust brake. ings are dragging. needed. The caliper is seized on the slide Clean, replace or repair slide pins or pins.
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