994K Large Wheel Loader TA2 Technical Inspection {0372, 1000, 7000, 753T, 7565} Caterpillar

Wheel Loader

994K (S/N: MM91-UP; MRK1-UP; SMX1-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

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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 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, UENR0950, "Charging System - Test".
	Electric Starting System Test	12 to 16 V at −23° C (−10° F) to −7° C (19° F)		Refer to Special Instruction, UENR4347, "Charging 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

Reference: Testing & Adjusting, UENR4347 for more detail on the following tests.

Fuel System

Table 2

Status(1)	Description	Specification	Actual	Comments
	Fuel Pressure	415 to 450 kPa (60 to 65 psi)

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

Cooling System

Table 3

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.

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

Lubrication System

Table 4

Status(1)	Description	Specification	Actual	Comments
	Engine Oil Pressure at Low Idle	140 kPa (20 psi)
	Engine Oil Pressure at rated rpm	280 to 600 kPa (40 to 87 psi)

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

Basic Engine

Table 5

Status(1)	Description	Specification	Actual	Comments
	Engine Speed at Low Idle	750 ± 10 rpm
	Engine Speed at High Idle	1700 ± 10 rpm
	Torque Converter Stall Test Engine RPM
	Cylinder Cutout Test			Caterpillar Electronic Technician
	Engine Crankcase Pressure (Blowby)

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

Air Inlet and Exhaust System

Table 6

Status(1)	Description	Specification	Actual	Comments
	Torque Converter Stall Test Boost Pressure	-
	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, UENR4904, "994K Wheel Loader Machine Systems" for more detail on the following test.

Implement Cycle Time-Check

Table 7

Status(1)	Description	Specification	Actual	Comments
	Rack Back	2.4 seconds
	Lift	9.2 seconds
	Dump (Max Lift)	1.8 seconds
	Power Down	3.8 seconds
	Float Down	3.7 seconds

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

Pump Performance (Implement) (Lift Time) - Test

This test is performed using the operator monitor. Refer to Testing and Adjusting, UENR4904, "Pump Performance (Implement) (Lift Time) - Test" for further instruction.

Table 8

Lift Times
Pump	Time
	Standard Lift (SL)	High Lift (HL)
Right Front, Right Rear 250 cc (15.3 cubic inch)	47.4 seconds	47.4 seconds
Left Front, Left Rear 250 cc (15.3 cubic inch)	47.4 seconds	47.4 seconds

Pump Performance (Steering)- Test

This test is performed using the operator monitor. Refer to Testing and Adjusting, UENR4904, "Pump Performance (Implement) (Lift Time) - Test" for further instruction.

Table 9

Status(1)	Description	Specification	Actual	Comments
	Steering Cycle time	4.3 ± 0.3 seconds

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

Brake Performance Checks

Table 10

Status(1)	Description	Specification	Actual	Comments
	Brake Accumulator - Test (Test from OMM)
	Service Brake Holding Ability Test- Test (Test from OMM)
	Parking Brake Holding Ability Test- Test (Test from OMM)

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

Hydraulic System

Reference: Refer to Testing & Adjusting, UENR4904, "994K Wheel Loader Machine Systems" for more detail on the following test.

Pilot Pressure - Check

Table 11

Status(1)	Description	Specification	Actual	Comments
	Pilot pressure at high idle	3450 kPa (500 psi)

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

Pressure Reducing Valve Pressure for Dead Engine Pilot Supply (Engine OFF) - Test and Adjust

Table 12

Status(1)	Description	Specification	Actual	Comments
	Pilot oil pressure for a dead engine	1580 ± 150 kPa (229 ± 22 psi)

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

Pilot Pressure (Pressure Reducing Valve) - Test and Adjust

Table 13

Status(1)	Description	Specification	Actual	Comments
	Pilot pressure at engine speed set at high idle (1700 rpm ± 25 rpm) and operating temperature range 50° C to 88° C (122° F to 190° F)	3500 ± 345 kPa (507 ± 50 psi)

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

Pilot Control Actuator Pressure - Check

Table 14

Status(1)	Description	Specification	Actual	Comments
	Pilot Control Actuator Pressure	3500 ± 150 kPa (507 ± 22 psi)

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

Relief Valve (Main) - Test and Adjust

Refer to Testing and Adjusting , UENR4904 , "Relief Valve Pressure (Main) - Test and Adjust" for further instruction.

Table 15

Status(1)	Description	Specification	Actual	Comments
	Relief Valve Main Pressure (Left)	32800 ± 600 kPa (4750 ± 90 psi)
	Relief Valve Main Pressure (Right)	32800 ± 600 kPa (4750 ± 90 psi)

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

Power Train System

Reference: Refer to Testing & Adjusting, UENR4904 , "Power Train System" for more detail on the following tests.

Torque Converter Impeller Clutch Pressure - Test

Table 16

Torque Converter Pressure
Pressure	Pressure Tap	Pressure at High Idle	Adjustment
Torque Converter Inlet	(D)	Maximum pressure with cold oil is 900 kPa (130 psi).	-
Impeller Clutch	(F)	Maximum pressure is 2176 ± 275 kPa (315.6 ± 40 psi).	-
Torque Converter Outlet	(G)	Pressure is 470 ± 100 kPa (68 ± 14 psi). (These pressures are for a machine in third speed, with activated brakes, with installed axle shafts, and with the torque converter in a stall condition.)	-

Torque Converter Stall (3FWD) - Test

Table 17

Status(1)	Description	Specification	Actual	Comments
	Torque Converter Stall speed	1588 ± 50 rpm

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

Torque Converter Stall and Implement Pump Double Stall - Test

Table 18

Status(1)	Description	Specification	Actual	Comments
	Raise double stall engine speed	1405 ± 50 rpm

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

Torque Converter Lockup Clutch Pressure - Test

Table 19

Status(1)	Description	Specification	Actual	Comments
	Lockup clutch pressure	2340 ± 70 kPa (339 ± 10 psi). The maximum pressure is 70 kPa (10 psi) when the solenoid is not activated.

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

Transmission Pressure - Test

Table 20

Status(1)	Transmission Pressure				Comments
	Pressure	Position of Governor Control Lever		Actual
		Pressure at Low Idle	Pressure at High Idle
	Oil Pump	This pressure is identical to speed clutch pressure P1.	This pressure is identical to speed clutch pressure P1.
	Speed Clutch P1	The minimum pressure is 2200 kPa (319 psi). Plug (K) for the load piston is installed.	This pressure is 2760 ± 175 kPa (400 ± 25 psi) when the direction switch is in FORWARD or in Reverse and any speed is selected. Plug (K) for the load piston is installed.
	Direction Clutch P2	This minimum pressure is 1750 kPa (254 psi).	This pressure is 2170 ± 140 kPa (400 ± 25 psi).
	Transmission Lubrication Oil	The minimum pressure is 21 kPa (3 psi)	The minimum pressure is 110 kPa (16 psi).

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

Steering System

Reference: Refer to Testing & Adjusting, UENR4904, "994K Wheel Loader Machine Systems" for more detail on the following tests.

Steering System Pressures - Test

Table 21

Status(1)	Description	Specification	Actual	Comments
	Steering pilot valve supply pressure	3800 ± 300 kPa (551 ± 44psi)
	Maximum steering pump pressure	31000 ± 600 kPa (4496 ± 87 psi)
	Load sense relief valve pressure	28900 ± 500 kPa (4192 ± 73 psi)
	Steering valve pilot pressure	3800 ± 300 kPa (551 ± 44 psi)
	Margin pressure	2100 ± 100 kPa (305 ± 15 psi)
	Steering control valve pilot pressure (when STIC in the centered position)	0
	Steering cylinder crossover relief valve pressure	34500 kPa (5000 psi)
	Secondary steering relief valve pressure	20950 kPa (3040 psi)

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

Piston Pump (Steering) Margin Pressure - Test and Adjust

Table 22

Status(1)	Description	Specification	Actual	Comments
	Margin Pressure	2100 ± 100 kPa (305 ± 15 psi)

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

Steering Main System Relief Pressure - Test and Adjust

Table 23

Status(1)	Description	Specification	Actual	Comments
	Cutoff Pressure	32500 ± 500 kPa (4714 ± 73 psi)

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

Relief Valve (Secondary Steering) - Test and Adjust

Table 24

Status(1)	Description	Specification	Actual	Comments
	Secondary steering relief valve pressure	20950 ± 345 kPa (3050 ± 50 psi)

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

Steering Neutralizer Valve - Check

Table 25

Status(1)	Description	Specification	Actual	Comments
	Minimum Putty Thickness	3 to 5 mm (0.1 ± 0.2inch)

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

Brake and Hydraulic Fan System

Reference: Refer to Testing & Adjusting, UENR4904, "994K Wheel Loader Machine Systems" for more detail on the following tests.

Hydraulic Fan Speed - Test and Adjust

Table 26

994K Hydraulic Fan Speeds (1)
	High Ambient Max Speed		Standard Ambient Max Speed		Minimum Fan Speed
Altitude	0° C (32° F)	32° C (90° F)	0° C (32° F)	32° C (90° F)	0° C (32° F)	32° C (90° F)
305 m (1000 ft)	580 rpm	624 rpm	520 rpm	559 rpm	216 rpm	233 rpm
610 m (2000 ft)	591 rpm	636 rpm	529 rpm	570 rpm	221 rpm	237 rpm
914 m (3000 ft)	602 rpm	649 rpm	539 rpm	581 rpm	225 rpm	242 rpm
1219 m (4000 ft)	613 rpm	662 rpm	549 rpm	593 rpm	229 rpm	247 rpm
1524 m (5000 ft)	625 rpm	675 rpm	560 rpm	605 rpm	233 rpm	252 rpm
1829 m (6000 ft)	637 rpm	689 rpm	571 rpm	617 rpm	238 rpm	257 rpm
2134 m (7000 ft)	650 rpm	703 rpm	582 rpm	630 rpm	242 rpm	262 rpm
2438 m (8000 ft)	662 rpm	718 rpm	593 rpm	643 rpm	247 rpm	268 rpm
2743 m (9000 ft)	675 rpm	733 rpm	605 rpm	656 rpm	252 rpm	274 rpm
3048 m (10000 ft)	689 rpm	735 rpm	617 rpm	670 rpm	257 rpm	279 rpm

(1)	The hydraulic fan speed calibration setting is a dynamic value based on both altitude and ambient temperature. The table values are for reference only. The actual values will be shown in ET. Fan speeds are based on the ambient temperature and altitude listed.

Piston Pump (Brake) Pressure - Test and Adjust

Table 27

Status(1)	Description	Specification	Actual	Comments
	Brake Oil Pressure	16000 ± 345 kPa (2300 ± 50 psi)

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

Service Brake System Pressure - Test

Table 28

Status(1)	Description	Specification	Actual	Comments
	Service Brake Pressure	4827 ± 345 kPa (700 ± 50 psi)

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

Service Brake - Check

Table 29

Status(1)	Description	Specification	Actual	Comments
	Oil pressure in the accumulator	15800 ± 420 kPa (2292 ± 61 psi)

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

Service Brake - Check

Table 30

Brake Disc Wear Information
Percentage of Remaining Brake Disc Life	Disc Thickness	Oil Groove Depth
100	4.70 mm (0.185 inch)	0.70 mm (0.028 inch)
80	4.55 mm (0.179 inch)	0.62 mm (0.025 inch)
60	4.40 mm (0.173 inch)	0.55 mm (0.022 inch)
40	4.24 mm (0.167 inch)	0.47 mm (0.019 inch)
20	4.09 mm (0.161 inch)	0.40 mm (0.016 inch)
0	3.94 mm (0.155 inch)	0.32 mm (0.013 inch)

Parking Brake System Pressure - Test

Table 31

Status(1)	Description	Specification	Actual	Comments
	Accumulator Pressure with Engine Running	13789 ± 345 kPa (2000 ± 50 psi)
	Accumulator Pressure at which the Parking Brake Engages	< 6550 kPa (950 psi)

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

S·O·S Samples

Reference: Refer to Operation and Maintenance Manual, SEBU9196, "Maintenance Interval Schedule" for more detail on performing S.0.S samples.

Engine Oil Sample

Table 32

Status(1)	Description	Obtain	Comments
	Engine Oil Sample

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

Engine Coolant Sample

Table 33

Status(1)	Description	Obtain	Comments
	Engine Coolant Sample

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

Hydraulic Oil Sample

Table 34

Status(1)	Description	Obtain	Comments
	Hydraulic Oil Sample

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

Differential & Final Drive Oil Samples (Inboard Final Drives)

Table 35

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 36

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 37

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

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