938H Wheel Loader TA2 Technical Inspection{0372, 1000, 7000, 753T, 7565} Caterpillar

Wheel Loader:

938H (S/N: LKM1-UP)

Introduction

Inspections are the most basic form of condition monitoring. Inspections are easy to do and surprisingly effective at helping you spot equipment health issues. Proactive monitoring and analysis of equipment information will allow Dealers to intervene effectively before problems occur.

Note: Before adjusting product settings to comply with listed baseline TA2 values, consult SIS for the latest specification values.

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Electrical System

Table 1

Status (1)	Description	Specification	Actual	Comments
	Inspect Battery Cables	Cables between the battery, the starter, and the engine ground must be the correct size. Wires and cables must be free of corrosion. Wires and cables must have cable support clamps in order to prevent stress on battery connections (terminals).
	Battery Test	12.4 VDC or more		Refer to Special Instruction, SEHS7633, "Battery Test Procedure".
	Charging System Test	18 VDC to 32 VDC		Refer to Special Instruction, REHS0354, "Charging System - Test".
	Electric Starting System Test	12 to 16 V at −23° C (−10° F) to −7° C (19° F)		Refer to Testing and Adjusting, KENR5291, "Electrical Starting System - Test".
		14 to 18 V at −7° C (19° F) to 10° C (50° F)
		16 to 24 V at 10° C (50° F) to 27° C (80° F)

( 1 )

N = Normal, M = Monitor, A = Action

Engine

Cooling System

Table 2

Status (1)	Description	Specification	Actual	Comments
	Radiator Pressure Relief (Radiator Cap) (2)	-
	Freezing Point of Engine Coolant	-
	Conditioner Test of Engine Coolant	-
	Belt Tension	Auto-Tension
	Difference between the Upper and Lower Radiator Tank Temperatures	-
	Jacket Water Inlet Temperature from Cooling System	85° C (185° F)		Start to open. Full open at 95° C (203° F)

( 1 )	N = Normal, M = Monitor, A = Action
( 2 )	Test for the pressure that is listed on the cap.

Fuel System

Table 3

Status (1)	Description	Specification	Actual	Comments
	Fuel Pressure at HIGH IDLE	400 to 500 kPa (58 to 73 psi)

( 1 )

N = Normal, M = Monitor, A = Action

Lubrication System

Table 4

Status (1)	Description	Specification	Actual	Comments
	Engine Oil Pressure at HIGH IDLE	315 kPa (46 psi) minimum

( 1 )

N = Normal, M = Monitor, A = Action

Air Inlet and Exhaust System

Table 5

Status (1)	Description	Specification	Actual	Comments
	Torque Converter Oil Temperature	76° to 104°C (169° to 219°F)
	Torque Converter Stall Speeds	2121 ± 65 RPM
	Cylinder # 1 Exhaust Temperature (2)
	Cylinder # 2 Exhaust Temperature (2)
	Cylinder # 3 Exhaust Temperature (2)
	Cylinder # 4 Exhaust Temperature (2)
	Cylinder # 5 Exhaust Temperature (2)
	Cylinder # 6 Exhaust Temperature (2)
	Cylinder # 7 Exhaust Temperature (2)
	Cylinder # 8 Exhaust Temperature (2)

( 1 )	N = Normal, M = Monitor, A = Action
( 2 )	Compare the exhaust temperature variance at each exhaust port.

Performance Checks

ReferenceRefer to Testing & Adjusting, RENR8996, "Hydraulic System" and Testing & Adjusting, RENR8990, "Steering System" for more detail on the following test.

Implement Cycle Time - Check

Table 6

Status (1)	Description	Specification	Actual	Comments
	Implement Cycle Time for lift control lever at RAISE position	6.1 ± 0.5 seconds
	Implement Cycle Time for lift control lever at LOWER position	3.8 ± 0.5 seconds
	Implement Cycle Time for lift control lever at float to ground position	2.8 ± 0.5 seconds
	Implement Cycle Time for lift control lever at TILTBACK position	2.6 ± 0.5 seconds
	Implement Cycle Time for lift control lever at DUMP position	2.0 ± 0.5 seconds

( 1 )

N = Normal, M = Monitor, A = Action

Lift and Tilt Cylinder Drift - Check

Lift Cylinder

Table 7

Status (1)	Description	Specification	Actual	Comments
	Maximum Implement Drift in 5.0 minutes	2.7 mm (0.11 inch)

( 1 )

N = Normal, M = Monitor, A = Action

Tilt Cylinder

Table 8

Status (1)	Description	Specification	Actual	Comments
	Maximum Implement Drift in 5.0 minutes	2.7 mm (0.11 inch)

( 1 )

N = Normal, M = Monitor, A = Action

Steering Time - Check

Table 9

Status (1)	Description	Specification	Actual	Comments
	Left Steering Time at HIGH IDLE	2.7 ± 0.5 sec
	Right Steering Time at HIGH IDLE	2.7 ± 0.5 sec
	Left Turn/Right Turn Time Difference	0.3 sec

( 1 )

N = Normal, M = Monitor, A = Action

Hydraulic System

ReferenceRefer to Testing & Adjusting, RENR8996, "Hydraulic System" and Testing & Adjusting, RENR8990, "Steering System" for more detail on the following test.

Piston Pump (Implement, Steering) Margin Pressure - Test and Adjust

Table 10

Status (1)	Description	Specification	Actual	Comments
	Implement Piston Pump Margin Pressure (Float)	2600 ± 100 kPa (375 ± 15 psi)

( 1 )

N = Normal, M = Monitor, A = Action

Pilot Pressure to the Main Control Valve - Check

Table 11

Status (1)	Description	Specification	Actual	Comments
	Pilot Pressure at LOW IDLE	2620 ± 345 kPa (380 ± 50 psi)

( 1 )

N = Normal, M = Monitor, A = Action

Relief Valve (Signal) - Test and Adjust

Table 12

Status (1)	Description	Specification	Actual	Comments
	Relief Valve Pressure at LOW IDLE	27580 ± 690 kPa (4000 ± 100 psi)

( 1 )

N = Normal, M = Monitor, A = Action

Relief Valve (Line) - Test and Adjust

Table 13

Status (1)	Description	Specification	Actual	Comments
	Line Relief Valve Pressure for Tilt Cylinder at Head End	31000 ± 350 kPa (4500 ± 50 psi)
	Line Relief Valve Pressure for Tilt Cylinder at Rod End	31000 ± 350 kPa (4500 ± 50 psi)
	Line Relief Valve Pressure for Auxiliary Cylinder at Head End	22100 ± 350 kPa (3200 ± 50 psi)
	Line Relief Valve Pressure for Auxiliary Cylinder at Rod End	22100 ± 350 kPa (3200 ± 50 psi)
	Line Relief Valve Pressure for Auxiliary circuit (fourth function) at Head End	22100 ± 350 kPa (3200 ± 50 psi)
	Line Relief Valve Pressure for Auxiliary circuit (fourth function) at Rod End	22100 ± 350 kPa (3200 ± 50 psi)

( 1 )

N = Normal, M = Monitor, A = Action

Pilot Oil Accumulator (Dead Engine, Lift Arm Lower) - Test and Charge

Table 14

Status (1)	Description	Specification	Actual	Comments
	Pilot Oil Accumulator Pressure at HIGH IDLE	2620 ± 345 kPa (380 ± 50 psi)
	Pilot Oil Accumulator Pressure (Dead Engine Lower)	690 ± 34 kPa (100 ± 5 psi)

( 1 )

N = Normal, M = Monitor, A = Action

Braking and Hydraulic Fan System

ReferenceRefer to Testing & Adjusting, RENR8993, "Braking and Hydraulic Fan System" for more detail on the following test.

Service Brake System Pressure - Test

Table 15

Status (1)	Description	Specification	Actual	Comments
	Front Service Brake Pressure	3327 ± 224 kPa (483 ± 32 psi)
	Rear Service Brake Pressure	3327 ± 224 kPa (483 ± 32 psi)

( 1 )

N = Normal, M = Monitor, A = Action

Hydraulic Fan Speed - Test and Adjust

Table 16

Status (1)	Description	Specification	Actual	Comments
	Margin Pressure at HIGH IDLE	1800 ± 100 kPa (260 ± 15 psi)
	High Pressure Cutoff at HIGH IDLE	18800 ± 690 kPa (2700 ± 100 psi)
	Maximum Fan Speed at HIGH IDLE	1620 ± 50 RPM (2)
	Minimum Fan Speed at LOW IDLE	500 ± 50 RPM (3)

( 1 )	N = Normal, M = Monitor, A = Action
( 2 )	If the machine is equipped with the variable pitch fan, set the fan speed to 1680 ± 50 rpm.
( 3 )	If the machine is equipped with the variable pitch fan, set the fan speed to 550 ± 50 rpm.

Steering System

ReferenceRefer to Testing & Adjusting, RENR8996, "Hydraulic System" and Testing & Adjusting, RENR8990, "Steering System" for more detail on the following test.

Piston Pump (Implement, Steering) High Pressure Stall - Test and Adjust

Table 17

Status (1)	Description	Specification	Actual	Comments
	Maximum Steering Pump Pressure at HIGH IDLE	22821 ± 1034 kPa (3310 ± 150 psi)

( 1 )

N = Normal, M = Monitor, A = Action

Piston Pump (Implement, Steering) Margin Pressure - Test and Adjust

Table 18

Status (1)	Description	Specification	Actual	Comments
	Margin Pressure at LOW IDLE	2600 ± 100 kPa (375 ± 15 psi)

( 1 )

N = Normal, M = Monitor, A = Action

Power Train System

ReferenceRefer to Testing & Adjusting, RENR8985, "Power Train" for more detail on the following test.

Transmission Pressures - Test and Adjust

Table 19

Status (1)	Description	Specification	Actual	Comments
	Transmission Clutch Pressure - Modulating Valve for Clutch 1	1655 ± 70 kPa (240 ± 10 psi)
	Transmission Clutch Pressure - Modulating Valve for Clutch 2	2248 ± 70 kPa (325 ± 10 psi)
	Transmission Clutch Pressure - Modulating Valve for Clutch 3	1655 ± 70 kPa (240 ± 10 psi)
	Transmission Clutch Pressure - Modulating Valve for Clutch 4	2248 ± 70 kPa (325 ± 10 psi)
	Transmission Clutch Pressure - Modulating Valve for Clutch 5	2248 ± 70 kPa (325 ± 10 psi)
	Transmission Clutch Pressure - Modulating Valve for Clutch 6	2248 ± 70 kPa (325 ± 10 psi)

( 1 )

N = Normal, M = Monitor, A = Action

Test for the Torque Converter Inlet Pressure

Table 20

Status (1)	Description	Specification	Actual	Comments
	Torque Converter Inlet Pressure at Pressure Tap (P2)	850 ± 70 kPa (125 ± 10 psi)

( 1 )

N = Normal, M = Monitor, A = Action

Test for the Torque Converter Outlet Pressure

Table 21

Status (1)	Description	Specification	Actual	Comments
	Torque Converter Outlet Pressure at HIGH IDLE	586 ± 140 kPa (85 ± 20 psi)

( 1 )

N = Normal, M = Monitor, A = Action

Test for the Lubrication Oil Pressure

Table 22

Status (1)	Description	Specification	Actual	Comments
	Lubrication Oil Pressure (Minimum) at HIGH IDLE	140 kPa (20 psi)

( 1 )

N = Normal, M = Monitor, A = Action

Adjustment for the Transmission Oil Pump Pressure

Table 23

Status (1)	Description	Specification	Actual	Comments
	Transmission Oil Pump Pressure at Pressure Tap (P1) at HIGH IDLE	2248 ± 70 kPa (325 ± 10 psi)

( 1 )

N = Normal, M = Monitor, A = Action

S·O·S Samples

ReferenceRefer to Operation and Maintenance Manual, SEBU8079, "Maintenance Interval Schedule" for more detail on performing S.O.S samples.

Engine Oil Sample

Table 24

Status (1)	Description	Obtain	Comments
	Engine Oil Sample

( 1 )

N = Normal, M = Monitor, A = Action

Engine Coolant Sample

Table 25

Status (1)	Description	Obtain	Comments
	Engine Coolant Sample

( 1 )

N = Normal, M = Monitor, A = Action

Hydraulic Oil Sample

Table 26

Status (1)	Description	Obtain	Comments
	Hydraulic Oil Sample

( 1 )

N = Normal, M = Monitor, A = Action

Differential & Final Drive Oil Samples (Inboard Final Drives)

Table 27

Status (1)	Description	Obtain	Comments
	Front Differential & Final Drive Oil Sample
	Rear Differential & Final Drive Oil Sample

( 1 )

N = Normal, M = Monitor, A = Action

Differential & Final Drive Oil Samples (Outboard Final Drives)

Table 28

Status (1)	Description	Obtain	Comments
	Front Differential Oil Sample
	Rear Differential Oil Sample
	Left Front Final Drive Oil Sample
	Right Front Final Drive Oil Sample
	Left Rear Final Drive Oil Sample
	Right Rear Final Drive Oil Sample

( 1 )

N = Normal, M = Monitor, A = Action

Transmission/Torque Converter Oil Sample

Table 29

Status (1)	Description	Obtain	Comments
	Transmission/Torque Converter Oil Sample

( 1 )

N = Normal, M = Monitor, A = Action