OM3005.2 Operation - Section 3 Operator Cab and Controls Page 3-13 (7) Service Brake Pedal The Service Brake Pedal is the middle pedal of the three pedals. It controls a dual hydraulic valve, which applies both the front dry disc brakes and the rear wet disc brakes. The service brakes should be used to slow or stop the truck whenever safety and/or truck speed/load conditions exceeds the capability of the retarder. "R2" position may be used for job operations that would benefit from a higher speed reverse operation. This range selection utilizes a 3.43 : 1 gear reduction ratio.
COMPLETELY STOP the truck and bring engine RPM to low idle before shifting from "N" to "R1"; "R1" to "R2" ; "R2" to "R1" ; or from either position to "N ". (8) Throttle Pedal "D" DRIVE - position. The transmission will shift to first gear and as truck speed increases, the transmission will automatically upshift through each gear to sixth gear operation. As the truck slows down, the transmis- sion will automatically downshift to the correct gear. The Throttle Pedal is the right pedal of the three pedals. The operator increases engine RPM by depressing the throttle pedal. Engine RPM is decreased by releasing the pedal. (9) Lighter 5, 4, 3, 2 - positions.
Road and load conditions some- times make it desirable to limit the automatic shifting to a lower range. These positions provide greater en- gine braking on grades. The transmission will not shift above the highest gear selected. When conditions improve, select position D for full range operation. Used for lighting cigars/cigarettes. Always use CAU- TION with smoking materials. (10) Ash Tray 1 - Use this range selection when pulling through mud and deep snow, or when maneuvering in tight spaces, and when driving up or down steep grades where maximum driving power and maximum engine braking is needed. Used for extinguishing and depositing smoking mate- rials.
DO NOT use for flammable materials such as paper wrappers. Be certain that all fire ash is extin- guished. NOTE: As engine and ground speed increases, the transmission will automatically UPSHIFT to the gear range required up to the highest range selected. How- ever, DOWNSHIFTS will not occur, regardless of gear range selected, until engine and ground speed are reduced to match the next lower gear range require- ments. (11) Range Selector The lever-type range selector has nine positions ( R2, R1, N, D, 5, 4, 3, 2 and 1 ). To change positions, release the range holding mechanism (below knob) on the lever, and move lever to the desired range.
"N" NEUTRAL - used when truck is stopped/parked with engine operating, and when starting engine. The truck cannot be started unless the Range Selector is in NEUTRAL position. "R1" or "R2" REVERSE position - is used to back the truck. The Reverse Warning Horn is activated when either gear is selected. When selecting either reverse position, COMPLETELY STOP the truck and bring engine RPM to low idle before shifting from a FOR- WARD range to a REVERSE range or vice-versa. "R1" position should be used for normal reverse operation. This range selection utilizes the standard 5.12 : 1 gear reduction ratio. RANGE SELECTOR 11. Range Selector Knob 12. DO NOT SHIFT Light