IDENTIFICATION NUMBERS/MACHINE COMPONENTS ......................... 12

The 988 is an all hydraulic machine. It consists of a P type undercarriage (of which there are 5 versions: P, PL, P2A, P2AL and P2A+2A) fitted with the travel components and the turntable bearing to which the upperstructure frame is attached. The upperstructure frame supports the attachments at the front of the machine and contains the engine, the hydraulics and the operator’s compartment. When the operator works the controls, the engine driven variable flow pump delivers hydraulic fluid to the control valves. The control valves distribute the hydraulic fluid to the various cylinders and hydraulic motors. A cooling system and oil cooler maintain the fluid temperature at normal working temperature.

Key to main components (P2AL version)

1 Cab 2 Instrument panel/Control panel 3 Fuel tank 4 Swing reduction gear motor 5 Hydraulic swivel 6 Undercarriage 7 Dozer blade 8 Front axle 9 Hydraulic travel motor 10 Gearbox 11 Axle reduction gears 12 Tires 13 Rear axle 14 Stabilizers 15 Turntable bearing 16 Upperstructure 17 Operator’s compartment 18 Swing control valve 19 Attachment control valve 20 Valve bank partition 21 Brake circuit filter 22 Batteries 23 Hydraulic filters 24 Hydraulic pump 25 Hydraulic reservoir 26 Air filter 27 Counterweight 28 Engine hood 29 Radiator and oil cooler 30 Engine 31 Valve bank partition hood 32 Stabilizer beam 33 Selection block circuit filter