988K Wheel Loader TA2 Technical Inspection {0372, 1000, 7000, 753T, 7565} Caterpillar

Wheel Loader

988K (S/N: T8E1-UP; L8X1-UP; LWX1-UP; TWX1-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.

Creating an Electronic Copy

Use the following procedure to create an editable electronic copy from SIS Web.

1. Click format to print.

2. Save the document as an HTML format.

3. Open the document with Microsoft Word.

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
	Electric Starting System Test	12 to 16 V at −23 °C (−10 °F) to −7 °C (19 °F)		Refer to Testing and Adjusting, SENR9832, "Electric 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	-		Refer to Operation and Maintenance Manual.
	Difference between the Upper and Lower Radiator Tank Temperatures	-
	Aftercooler Water Outlet Temperature

(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	820.5 ± 165.5 kPa (119.0 ± 24.0 psi)

(1)	N = Normal, M = Monitor, A = Action

Lubrication System

Table 4

Status(1)	Description	Specification	Actual	Comments
	Engine Oil Pressure at Low Idle	103.4 to 599.8 kPa (15.0 to 87.0 psi)
	Engine Oil Pressure at Rated Speed	275.8 to 599.8 kPa (40.0 to 87.0 psi)

(1)	N = Normal, M = Monitor, A = Action

Basic Engine

Table 5

Status(1)	Description	Specification	Actual	Comments
	Engine Speed at Low Idle	750 ± 20 rpm
	Engine Speed at High Idle	1860 ± 20 rpm
	Torque Converter Stall Speed (1FWD) (2)	1600 ± 35 rpm
	Torque Converter Stall Speed (3FWD) (2)	1725 ± 35 rpm
	Cylinder Cutout Test	-		Cat® Electronic Technician (Cat ET Service Tool

(1)	N = Normal, M = Monitor, A = Action
(2)	All tests for stall speeds should be ran in forward direction.

Air Inlet and Exhaust System

Table 6

Status(1)	Description	Specification	Actual	Comments
	Torque Converter Stall Test Boost Pressure	192.3 kPa (56.8 inch mercury)
	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.

Hydraulic Performance Checks

Reference: Refer to Testing & Adjusting, KENR6488, "Hydraulic System" for more detail on the following test.

Implement Cycle Time-Check

Table 7

Status(1)	Description	Specification	Actual	Comments
	Lift Raise	8 Seconds
	Lift Lower	8 seconds
	Float	3.5 Seconds

(1)	N = Normal, M = Monitor, A = Action

Lift and Tilt Cylinder Drift - Check

Table 8

Status(1)	Description	Specification	Actual	Comments
	Oil Temperature	40 °C (104 °F)
	Lift Cylinder	20 mm (0.8 inch) In 5 minutes
	Tilt Cylinder	15 mm (0.6 inch) In 5 minutes

(1)	N = Normal, M = Monitor, A = Action

Brake Performance Checks

Reference: Refer to Testing & Adjusting, KENR6488, "Brake System" for more detail on the following test.

Table 9

Status(1)	Description	Specification	Actual	Comments
	Brake Accumulator - Test (Test from OMM)	Alert Indicator comes on after three or up to five applications of the brake
	Service Brake Holding Ability Test- Test (Test from OMM)	Transmission to third speed forward while applying service brakes. Machine should not move
	Parking Brake Holding Ability Test- Test (Test from OMM)	Engage parking brake. Move transmission to third gear forward with autoshift control inOFF position. Parking brake indicator should come on. Gradually increase engine speed machine should not move.

(1)	N = Normal, M = Monitor, A = Action

Steering Performance Checks

Reference: Refer to Testing & Adjusting, KENR6488, "Steering System" for more detail on the following test.

Command Control Steering Time - Check

Table 10

Status(1)	Description	Specification	Actual	Comments
	Left Steering Time (High Idle)	3.4 ± 0.3 seconds
	Right Steering Time (High Idle)	3.4 ± 0.3 seconds
	Left Steering Time (Low Idle)	5.6 ± 0.9 seconds
	Right Steering Time (Low Idle)	5.6 ± 0.9 seconds
	Left/Right Time Difference (Max)	0.3 seconds

(1)	N = Normal, M = Monitor, A = Action

Hydraulic System

Reference: Refer to Testing & Adjusting, KENR6488, "Hydraulic System" for more detail on the following test.

Implement Double Stall - Test

Reference: Refer to Testing and Adjusting, KENR6488, "Tests (Cat ET)" for more information.

Table 11

Status(1)	Description	Specification	Actual	Comments
	Torque Converter Oil Temperature	Cat ET
	Boost Pressure	Cat ET
	Engine Speed	Cat ET

(1)	N = Normal, M = Monitor, A = Action

Implement Piston Pump Margin Pressure (Float)

Reference: Refer to Testing and Adjusting, KENR6488, "Tests (Cat ET)" for more information on this test.

Table 12

Status(1)	Description	Specification	Actual	Comments
	Implement Piston Pump Margin Pressure (Float)	Cat ET

(1)	N = Normal, M = Monitor, A = Action

Pilot Pressure to the Main Control Valve

Table 13

Status(1)	Description	Specification	Actual	Comments
	Pilot Pressure to the Main Control Valve	3800 ± 200 kPa (551 ± 29 psi)

(1)	N = Normal, M = Monitor, A = Action

Load Sensing Signal Relief Valve - Test and Adjust

Reference: Refer to Testing and Adjusting, KENR6488, "Pilot Control Actuator Pressure - Check" for more information.

Table 14

Status(1)	Description	Specification	Actual	Comments
	Load Sensing Signal Relief Valve - Test and Adjust	3800 ± 300 kPa (551 ± 44 psi)

(1)	N = Normal, M = Monitor, A = Action

Pilot Oil Accumulator (Dead Engine Lower) - Test

Table 15

Status(1)	Description	Specification	Actual	Comments
	Oil Temperature	Cat ET
	Accumulator Pressure (Dead Engine Lower)	1800 kPa (261 psi)

(1)	N = Normal, M = Monitor, A = Action

Ride Control Accumulator - Test

Reference: Refer to Testing and Adjusting, KENR6488, "Ride Control Accumulator - Test and Charge" for more information on this test.

Table 16

Status(1)	Description	Specification	Actual	Comments
	Charge Pressure (at Ambient Temperature)	21 °C (70 °F) at 3800 kPa (551 psi)

(1)	N = Normal, M = Monitor, A = Action

Power Train System

Tire Pressure

Table 17

Status(1)	Description	Specification	Actual	Comments
	Front Left Tire Pressure
	Front Right Tire Pressure
	Rear Left Tire Pressure
	Rear Right Tire Pressure

(1)	N = Normal, M = Monitor, A = Action

Calibrate Fill time for the Transmission Clutch

Reference: Refer to Testing and Adjusting, KENR6488, "Calibrations (Cat ET)"

Table 18

Status(1)	Description	Specification	Actual	Comments
	Calibrate Fill time for the Transmission Clutch	Cat ET

(1)	N = Normal, M = Monitor, A = Action

Test for the Transmission Clutch Pressure

Table 19

Status(1)	Description	Specification	Actual	Comments
	Clutch "1" Pressure	2800 ± 138 kPa (406 ± 20 psi)
	Clutch "2" Pressure	2800 ± 138 kPa (406 ± 20 psi)
	Clutch "3" Pressure	2800 ± 138 kPa (406 ± 20 psi)
	Clutch "4" Pressure	2800 ± 138 kPa (406 ± 20 psi)
	Clutch "5" Pressure (Second	2300 ± 138 kPa (334 ± 20 psi)
	Clutch "6" Pressure	2800 ± 138 kPa (406 ± 20 psi)

(1)	N = Normal, M = Monitor, A = Action

Torque Converter Inlet Pressure (High Idle)

Table 20

Status(1)	Description	Specification	Actual	Comments
	Torque Converter Inlet Pressure (High Idle)	550 kPa (80 psi)

(1)	N = Normal, M = Monitor, A = Action

Torque Converter Outlet Pressure (Torque Converter Stall)

Table 21

Status(1)	Description	Specification	Actual	Comments
	Torque Converter Outlet Pressure	448 ± 103 kPa (65 ± 15 psi)

(1)	N = Normal, M = Monitor, A = Action

Transmission Lubrication Pressure (High Idle)

Table 22

Status(1)	Description	Specification	Actual	Comments
	Transmission Lubrication Pressure (High Idle)	105 kPa (15 psi)

(1)	N = Normal, M = Monitor, A = Action

Transmission Oil Pump Pressure (High Idle)

Table 23

Status(1)	Description	Specification	Actual	Comments
	Transmission Oil Pump Pressure (High Idle)	2965 ± 200 kPa (430 ± 29 psi)

(1)	N = Normal, M = Monitor, A = Action

Steering System

Piston Pump (Steering) High Pressure Stall - Test

Reference: Refer to Testing and Adjusting, KENR6488, "Steering System Pressure (High Pressure Stall) - Test and Adjust" for more information on this test.

Table 24

Status(1)	Description	Specification	Actual	Comments
	Piston Pump (Steering) High Pressure Stall - Test	High stall pressure 32000 ± 350 kPa (4641 ± 51 psi)

(1)	N = Normal, M = Monitor, A = Action

Piston Pump (Steering) Margin Pressure - Test

Reference: Refer to Testing and Adjusting, KENR6488, "Piston Pump (Steering) Margin Pressure - Test and Adjust"

Table 25

Status(1)	Description	Specification	Actual	Comments
	Margin Pressure	2100 kPa + 100 kPa - 350 kPa (305 psi +15 psi - 50 psi)

(1)	N = Normal, M = Monitor, A = Action

Relief Valve (Pump Backup) - Test

Reference: Refer to Testing and Adjusting, KENR6488, "Relief Valve (Pump Backup) - Test and Adjust" for more information.

Table 26

Status(1)	Description	Specification	Actual	Comments
	Relief Valve (Pump Backup) - Test	22500 ± 345 kPa (3263 ± 50 psi)

(1)	N = Normal, M = Monitor, A = Action

Steering Neutralizer Valve - Check

Reference: Refer to Testing and Adjusting, KENR6488, "Steering Neutralizer Valve - Check and Adjust" for more information.

Table 27

Status(1)	Description	Specification	Actual	Comments
	Right Side Gap (Engine Frame to Non-Engine Frame	12.7 ± 3.0 mm (0.50 ± 0.12 inch)
	Left Side Gap (Engine Frame to Non-Engine Frame	12.7 ± 3.0 mm (0.50 ± 0.12 inch)

(1)	N = Normal, M = Monitor, A = Action

Brake and Hydraulic Fan System

Reference: Refer to Testing & Adjusting, KENR6488, "Braking System" for more detail on the following test.

Service Brake System Pressure - Test

Table 28

Status(1)	Description	Specification	Actual	Comments
	Rear Service Brake Pressure (Brake ON)	5520 ± 170 kPa (801 ± 25 psi)
	Front Service Brake Pressure (Brake ON)	5520 ± 170 kPa (801 ± 25 psi)

(1)	N = Normal, M = Monitor, A = Action

Service Brake Wear Indicator

Reference: Refer to Testing and Adjusting, KENR6488, "Service Brake Wear Indicator - Check"

Table 29

Status(1)	Description	Specification	Actual	Comments
	FT3103 Brake Wear Gauge	“No Go” wear = <50% Return to Service “Go ”wear = >50% Continue check
	FT3104 Brake Wear Gauge	“No Go” wear = 50% to 75% Return to Service “Go” wear = > 75% Continue check
	. FT3103 Brake Wear Gauge	“No go Wear = 75% to 100% Schedule Brake Service Soon” “Go” Wear = > 100% Schedule Brake Service Immediately

(1)	N = Normal, M = Monitor, A = Action

S·O·S Samples

Reference: Refer to Operation and Maintenance Manual, SEBU8779, "S·O·S Information" for more detail on performing S.0.S samples.

Engine Oil Sample

Table 30

Status(1)	Description	Obtain	Comments
	Engine Oil Sample

(1)	N = Normal, M = Monitor, A = Action

Engine Coolant Sample

Table 31

Status(1)	Description	Obtain	Comments
	Engine Coolant Sample

(1)	N = Normal, M = Monitor, A = Action

Hydraulic Oil Sample

Table 32

Status(1)	Description	Obtain	Comments
	Hydraulic Oil Sample

(1)	N = Normal, M = Monitor, A = Action

Differential & Final Drive Oil Samples (Inboard Final Drives)

Table 33

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 34

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 35

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

(1)	N = Normal, M = Monitor, A = Action