CLUTCH
ENGINE
1
TRANSMI SSION HST
TRANSMI SSION TRANSMISSION
2
3
REAR HSTAXLE
4 5 A
6
REAR BRAKE AXLE
7 B
The turning force of the steering wheel (1) is transmitted through the handle shaft (2) to the handle shaft which is connected to the spline of the steering spool (7). The spool (7) is installed in the sleeve (4) which is installed in the steering unit housing (3). The spool (7) and sleeve (4) are fixed by the centering spring (6) and pin (5). The pin hole (A) on the sleeve (4) is fit to the outer diameter of the pin (5), but the pin hole (B) on the spool (7) is larger than the outer diameter of the pin, holding the pin loosely. Therefore, the spool (7) rotates with the steering connecting shaft (2) simultaneously, but the sleeve rotates approx. 10° later than the spool. When the spool stops rotating, the sleeve stops after rotating the remainder of approx. 10°. This is because the spool and sleeve are fixed by the centering spring (6). In other words, when the spool (7) and sleeve (4) are rotating clockwise or counterclockwise, being away from each other for approx. 10°, the oil hole for the left turn or the oil hole for the right turn is aligned to form the oil passage. When the spool (7) stops rotating and the sleeve (4) is returned to its original position (position relative to the spool) by the centering spring (6), the oil passage for the neutral position is formed. One end of the drive shaft (8) is connected to the pin (5) through the spool (7) while its other end is connected to the Gerotor in the Gerotor pump (9). The Gerotor pump (9) is operated whenever the steering wheel is turned, and it is installed to the steering system to make manual steering possible in case of engine shut-off or gear pump malfunction.
FRONT BRAKE AXLE
8
9
STEERING SYSTEM FRONT AXLE
10
A/C AND INDEX HEATER
HYDRAULIC ELECTRIC & DIAGNOSIS SYSTEM
HYDRAULIC STEERING SYSTEM
R52W903A
10-6264 of 450
DR72-W00
Dealer Copy -- Not for Resale
2.2 STEERING UNIT 2.1.1. OPERATING PRINCIPLE
GENERAL
SAFETY FIRST
STEERING SYSTEM - STRUCTURE AND OPERATING PRINCIPLE
