INTRODUCTION The 950H Wheel Loader, 962H Wheel Loader, and IT62H Integrated Toolcarrier have been updated to enhance performance and to meet the Tier III emissions regulations. The serial number prefixes of the H Series Medium Wheel Loaders are as follows: 950H Wheel Loader Aurora K5K Gosselies N1A Sagami J5J Piracicaba M1G 962H Wheel Loader Aurora K6K Gosselies N4A Sagami J6J Piracicaba M3G IT62H Integrated Toolcarrier Piracicaba M5G SIMILARITIES AND DIFFERENCES The most significant change to the H Series Medium Wheel Loaders is the machine configuration. Conventional (Hand Metering Unit (HMU) steering with electrohydraulic implement controls is the standard configuration. Command Control Steering (CCS) will be offered as an attachment. The engines in the "H" Series Medium Wheel Loaders are changing to Tier III emissions compliant Caterpillar engines with ACERT technology. The implement hydraulic system is changing to a Proportional Priority, Pressure Compensated (PPPC) system. The brake and fan systems are now combined, utilizing a single pump. Machine appearance has changed with the hydraulic tank being mounted behind the cab and two service centers located under the cab on the both sides of the machine. The operators station features new style switches. MACHINE APPEARANCE The top of the cooling package (1) is lower and the entire cooling package is wider on the 950H Wheel Loader, 962H Wheel Loader, and IT62H Integrated Toolcarrier. Two service centers, right side and left side, have been added to the machine. The service centers provide a central location for diagnostic tests, filters, and other components used to service the machine.

ENGINE The 950H Wheel Loader is equipped with the Caterpillar C7 ACERT engine, serial number prefix C7C. The displacement of the C7 ACERT engine is 7.2 liters with a rated gross power of 218 hp. The performance test specification for the C7 ACERT engine in the 950H Wheel Loader is 0K6730. The 962H Wheel Loader and IT62H Integrated Toolcarrier are equipped with the Caterpillar C7 ACERT engine, serial number prefix C7C. The displacement of the C7 ACERT engine is 7.2 liters with a rated gross power of 233 hp. The performance test specification for the C7 ACERT engine in the 962H Wheel Loader and IT62H Integrated Toolcarrier is 0K6731. IMPLEMENT HYDRAULIC SYSTEM The "H" series Medium Wheel Loaders are now equipped with a Proportional Priority, Pressure Compensated (3PC) implement hydraulic system. The 3PC hydraulic system is load sensing with a signal duplication valve, signal relief valve, pressure compensator valves, pressure differential relief valve, pressure reducing valve and a resolver network. Also, the 3PC valve has anti-drift solenoid valves for the lift and tilt functions. The implement control valve is a closed center valve. The 3PC hydraulic system will sense a demand for a change in flow and the implement pump will upstroke or destroke to provide the flow. The machine may also be equipped with an optional auxiliary function. The auxiliary section is installed between the ride control valve and the cover mainfold. When the engine is started and the implement control levers are in the HOLD position, the implement pump supplies standby oil flow to the 3PC valve group. The oil flows into the inlet manifold and is divided into two paths. The supply path for the implements flows through the inlet manifold into the tilt section where the flow path is divided again. One path flows to the tilt stem and is blocked. The second path flows to the lift control section, to the ride control section, to the optional auxiliary section, and to the cover manifold. Within the cover manifold, the oil flows to both the pilot pressure reducing valve (PRV) and the differential pressure relief valve. The differential pressure relief valve maintains a difference between the load sensing pressure and the pump supply oil pressure of 3000 kPa (435 psi). When all of the control valves are in the HOLD position, the implement pump is at low pressure standby. The differential pressure relief valve maintains the minimum pressure for low pressure standby. The standby pressure is directed to the pilot pressure reducing valve, and the pilot pressure reducing valve provides a regulated pilot oil pressure to activate the control valves as needed. The pilot oil flows from the PRV through the check valve to the pilot accumulator and the hydraulic lockout solenoid valve. If the wheel loader is equipped with the optional Command Control Steering (CCS), the oil flow will be shared by the implement pilot system and the steering pilot system. The hydraulic lockout solenoid valve is in the CLOSED position until the hydraulic lockout switch in the cab is activated. When the solenoid valve is energized, the solenoid valve opens and pilot oil flows to the various implement function solenoid valves. The second path of oil in the inlet manifold flows through the screen to the signal duplication valve. The signal duplication valve uses the pump supply oil to duplicate the signal from the

highest pressure in the resolver network. When all implement control valves are in the HOLD position, there is no load sensing signal in the resolver network. With no load sensing pressure present, the implement pump is at low pressure standby. The implement pump is a variable displacement piston pump. The pump control valve controls the angle of the swash plate (not shown). The implement pump supplies oil flow for the implement hydraulic system, the implement pilot system, and the optional CCS pilot system. Maximum angle stop adjustment screw is used to adjust the maximum upstroke position of the actuator piston in the pump control valve. The implement system calibrations for the "H" Series Medium Wheel Loaders are the same as they are for the "G"Series II Medium Wheel Loaders. The calibrations should be performed in the order in which they appear, lever position sensors, linkage position sensors, and the implement valve calibrations. The "H" Series Medium Wheel Loaders feature soft detents. When the lever position sensors are calibrated the levers must be held in the full travel positions. STEERING SYSTEM The steering systems on the "H" Medium Wheel Loaders remain virtually the same. As mentioned previously, the standard machines are equipped with Hand Metering Unit (HMU) steering. Command Control Steering (CCS) is available as an option. The location of the steering control valve for both systems has changed. The steering control valve is located on the output transfer gear of the transmission. This location offers improved access to the adjustable valves on the steering control valve. FAN AND BRAKE HYDRAULIC SYSTEM The fan and brake pump is located on the front gear train of the engine, on the right side of the machine. The fan and brake pump provides oil flow for the electronic demand fan system and the brake hydraulic system. The outlet pressure tap and the signal pressure tap are located on the fan and brake pump. Also located on the engine on the right side of the machine is the fan control.

INTRODUCTION 950H Wheel Loader 962H Wheel Loader IT62H Integrated Toolcarrier

SIMILARITIES AND DIFFERENCES MACHINE APPEARANCE ENGINE IMPLEMENT HYDRAULIC SYSTEM STEERING SYSTEM