422E, 428E, 432E, 434E, 442E and 444E Backhoe Loaders Hydraulic and Steering System Caterpillar

Worksheets - Troubleshoot

Usage:

422E DSK

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Table 1
CHART FOR THE HYDRAULIC PUMP TROUBLESHOOTING
Date	Serial Number
PRESSURE TEST AND TEST FOR THE FLOW COMPENSATOR
Item	Specification	Actual
Low Pressure Standby Test	2000 kPa to 3600 kPa (290 psi to 522 psi)
Margin Pressure Test	2150 kPa to 2450 kPa (312 psi to 355 psi)

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Table 3
Line Relief Valve Pressure Settings for 428E
Cylinder	Circuit	Setting	Actual
Loader Tilt Circuit for Parallel Lift Machines	Head End for the Dump Operation	17000 kPa to 19000 kPa (2466 psi to 2756 psi )

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Table 4
Line Relief Valve Pressure Settings for the 422E, and 428E
Cylinder	Circuit	Setting	Actual
Backhoe Boom	Head End to LOWER	19000 kPa to 21000 kPa (2756 psi to 3046 psi)

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Table 5
Pressure for the Signal Relief Valve of the Steering
Specification	Actual
16800 kPa to 19700 kPa (2437 psi to 2857 psi)

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Table 6
Maximum Implement Drift within 5 minutes
Cylinder	422E	428E	Actual
Loader Lift	12 mm (0.5 inch)
Loader Tilt
Loader Bucket
Stabilizer	5 mm (0.2 inch)
Backhoe Boom	10 mm (0.4 inch)
Backhoe Stick
Backhoe Extendable Stick
Backhoe Bucket

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Table 7
Maximum Cycle Times for the Loader
Sales Model	422E	428E	Actual
Lower	2.8 seconds	3.2 seconds
Raise (Ground to Stop) Single Tilt	4.5 seconds	NA
Raise (Ground to Stop) Parallel Lift	NA	5.5 seconds
Bucket Dump Single Tilt	2.0 seconds	NA
Bucket Rack Back Single Tilt	2.8 seconds	NA
Bucket Dump Parallel Lift	NA	3.5 seconds
Bucket Rack Back Parallel Lift	NA	2.5 seconds
Bucket Open	2.0 seconds
Bucket Close	2.1 seconds

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Table 8
Maximum Cycle Times for the Backhoe
Sales Model	422E	428E	Actual
Boom Lower	2.8 seconds	3.4 seconds
Boom Raise Ground to snubber	3.0 seconds
Bucket Dump	2.0 seconds
Bucket Curl	2.8 seconds
Stick In	3.3 seconds
Stick Out	2.8 seconds
Swing Stop to snubber	3.5 seconds
Extendable Stick Extend.	2.8 seconds
Extendable Stick Retract.	2.8 seconds

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Table 9
Date	Serial Number
STANDBY PRESSURE TEST AND TEST FOR THE FLOW COMPENSATOR
Item	Specification	Tolerance	Actual
Standby Pump Discharge Pressure at 1200 rpm	3350 kPa (486 psi)	750 kPa (109 psi)
Margin Pressure Test	2300 kPa (333 psi)	150 kPa (22 psi)
TESTS FOR THE TORQUE LIMITER
Item	Specification		Actual
Hydraulic Oil Temperature	65° ± 1 °C (149° ± 2 °F)
Engine Speed	2100 ± 10 rpm
Flow for the Low Torque Setting The target adjustment should be a flow rate of 89 L/min (23.5 US gpm).	80 to 115 L/min (21 to 30 US gpm) at 11500 ± 100 kPa (1668 ± 15 psi)
Flow for the High Torque Setting The target adjustment should be a flow rate of 101 L/min (26.7 US gpm).	95 to 110 L/min (25 to 29 US gpm) at 23000 ± 100 kPa (3336 ± 15 psi)

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Table 10
Hydraulic System Pressure Tests
System	Specification	Actual
Backhoe (double stall)	24800 ± 1000 kPa (3597 ± 145 psi)
Loader (double stall)	22800 ± 1000 kPa (3307 ± 145 psi) except 434E and 444E
Steering	16800 kPa to 19700 kPa (2437 psi to 2857 psi)
Pilot	3000 kPa to 3500 kPa (435 psi to 508 psi)

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Table 11
Specifications for Relief Valves		Actual
Hydraulic Circuit	432E, 434E, 442E, and 444E
Rod End for STICK OUT	27500 kPa (3989 psi)
Head End for STICK IN	27500 kPa (3989 psi)
Extendable Stick (if equipped) Rod End for retracting the stick	26500 kPa (3844 psi)
	26500 kPa (3844 psi)
SWING Swing LEFT Swing RIGHT	27000 kPa (3916 psi)
Backhoe BUCKET DUMP	30000 kPa (4351 psi)
Backhoe BUCKET CLOSE	30000 kPa (4351 psi)
BOOM RAISE	30000 kPa (4351 psi)
BOOM LOWER	16500 kPa (2393 psi)
Loader Rod End for the Dump Operation	Single Tilt 29000 kPa (4206 psi)
Loader Rod End for the Dump Operation	Parallel Lift 27500 kPa (3989 psi)
Loader Rod End for the Dump Operation 434E and 444E	Single Tilt machines 31500 kPa (4569 psi)
Head End for the Tilt Back Operation of the Loader	Parallel Lift 16500 kPa (2393 psi)
Head End for the Tilt Back Operation of the Loader	Single Tilt 19000 kPa (2756 psi)
Auxiliary (if equipped) for the Loader Line valve for the Head End Port B	24500 kPa (3553 psi)

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Table 12
Hydraulic Circuit	432E, 434E, 442E, and 444E	Actual
Independent Rear Maneuvering	20500 ± 1000 kPa (2973 ± 145 psi)

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Table 13
Test Specifications for Steering System
Test	Specification	Actual
Line Relief Pressure for Independent Rear Maneuvering (if equipped)	20500 ± 1000 kPa (2973 ± 145 psi)

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Table 14
Maximum Implement Drift within 5 minutes
Cylinder	432E	442E	434E	444E	Actual
Loader Lift	12 mm (0.5 inch)
Loader Tilt
Loader Bucket
Stabilizer	5 mm (0.2 inch)
Backhoe Boom	10 mm (0.4 inch)
Backhoe Stick
Backhoe Extendable Stick
Backhoe Bucket

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Table 15
Maximum Cycle Times for the Loader
Sales Model	432E	442E	434E	444E	Actual
Lower	3.0 seconds		4.0 seconds
Raise (Ground to Stop) Single Tilt	NA
Raise (Ground to Stop) Parallel Lift	4.9 seconds		5.2 seconds	5.7 seconds
Bucket Dump Single Tilt	NA
Bucket Rack Back Single Tilt	NA
Bucket Dump Parallel Lift	3.4 seconds		3.7 seconds	4.7 seconds
Bucket Rack Back Parallel Lift	2.4 seconds		2.4 seconds	3.0 seconds
Bucket Open	2.0 seconds
Bucket Close	2.1 seconds

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Table 16
Maximum Cycle Times for the Backhoe
Sales Model	432E	434E	442E	444E	Actual
Boom Lower	2.7 seconds		3.0 seconds
Boom Raise Ground to snubber	2.7 seconds		3.3 seconds
Bucket Dump	2.0 seconds		2.4 seconds
Bucket Curl	2.4 seconds		2.5 seconds
Stick In	3.8 seconds		4.5 seconds
Stick Out	3.4 seconds		4.0 seconds
Swing Stop to snubber	3.4 seconds
Extendable Stick Extend.	3.0 seconds
Extendable Stick Retract.	2.8 seconds