Case CX135SR Hydraulic Excavator

Description:

The Case CX135SR Hydraulic Excavator is a short-radius, full-sized excavator built for power in confined spaces. With excellent visibility, reduced tail swing, and high breakout force, the CX135SR is ideal for urban work zones, roadways, and residential excavation. This model combines power and precision with simplified serviceability and durable components.

Engine & Performance:

• Engine: Isuzu BB-4BG1TRP, Tier II turbocharged diesel

• Net Power: 85 hp (63.4 kW)

• Displacement: 4.3 L (262 cu in)

• Fuel Capacity: 52.8 gal (200 L)

Hydraulics:

• Hydraulic Flow (Main): 2 x 29.4 GPM (2 x 111 L/min)

• Relief Pressure: 4,980 psi (343 bar)

• System Type: Closed center with load-sensing, variable axial piston pumps

• Control System: Advanced pilot joystick control for smooth, responsive operation

Travel & Swing:

• Travel Speed: 2.2 mph (low), 3.5 mph (high)

• Swing Speed: 12.5 rpm

Key Dimensions & Specs:

• Operating Weight: 30,644 lbs (13,900 kg)

• Max Digging Depth: 18 ft 2 in (5.54 m)

• Max Reach at Ground Level: 27 ft 7 in (8.4 m)

• Bucket Digging Force: 21,000 lbf (93.4 kN)

Maintenance Highlights:

• Routine Checks: Engine oil, hydraulic oil, filters, swing gear, track tension

• Commonly Replaced Parts: Boom and arm seal kits, final drives, pilot control valves, pins and bushings

• Hydraulic cylinder seal kits for CX135SR

• Final drives for CX135SR

• Swing motors and bushings for Case CX series

Common Issues & Quick Fixes:

• Swing motor lag: Often from dirty hydraulic oil or clogged filter — flush system and replace filters

• Boom drift or weak lift: Caused by internal cylinder leakage — reseal with new kits

• Final drive leaking or overheating: Check seals and gear oil; replace worn components

Pro Tips:

• Always bleed air from hydraulic lines after replacing seals or cylinders

• Inspect and tighten track tension regularly to avoid roller damage

• Lubricate pivot points with high-pressure grease to extend pin life

Serial Number Info:

• Serial number plate located on the frame near the left-side track or behind the cab door

• Early serials begin with DAC135SR — confirm before ordering specific parts