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GSE Training Services Presents Stewart and Stevenson GT-50 Paymover ©GSE TRAINING 2010
Model GT-50/50H Tow Tractor INTRODUCTION Stewart and Stevenson ©GSE TRAINING 2010
Objectives At the end of this training, the student should: Be familiar with the various operator features of the Stewart and Stevenson GT-50/50H tow tractor Know the location and function of operator controls, warning lights, and indicators Location of access doors and major components Understand the pre-operational checklists ©GSE TRAINING 2010
Text Conventions The GT50/50H is a medium weight aircraft tow tractor. For the purposes of this training, forward or front is referenced from the driving position. And the left side as looking forward toward the front of the unit. ©GSE TRAINING 2010
Words in all capitals denote legends on the control panels. Example: The engine runs continuously when the selector switch is set to the ON position. Legends ©GSE TRAINING 2010
Directions may be indicated, and features keylined. Keyline numbers may repeat in successive chapters. 1 FWD Key Lines ©GSE TRAINING 2010
WARNINGS, CAUTIONS, and Notes WARNINGS, CAUTIONS, and Notes refer to specific items or operations of special interest to operators and maintenance personnel. WARNINGS and CAUTIONS refer to operations which involve danger to personnel and equipment. Notes refer to procedures which make operations easier. ©GSE TRAINING 2010
Introduction The GT50/50H is a diesel powered, four wheel drive tractor ©GSE TRAINING 2010
Tractor comes standard with two-wheel steering. Four-wheel, two mode or three mode steering can be ordered Powered by a six-cylinder Deutz diesel engine with a Funk 2000 series automatic transmission Operator position seats one driver and one passenger Optional front cab to protect driver can be ordered ©GSE TRAINING 2010
Vehicle body length of the GT-50 is 188 inches without hitches. Wheelbase is 90 inches Dimensions ©GSE TRAINING 2010
With the optional cab, the vehicle height is 86 inches. 86 ©GSE TRAINING 2010
And without the optional cab, 65 inches. 65 ©GSE TRAINING 2010
The tractor is 102 inches wide, and has a ground clearance of 10 inches ©GSE TRAINING 2010
Tow tractors are rated by weight and drawbar pull. The S&S GT-50 weighs 50,000 pounds. The tractive effort, or drawbar pull, can be 40,000 to 48,000 pounds, depending on surface conditions. The S&S GT50H weighs 60,000 pounds. ©GSE TRAINING 2010
The turning diameter is 43 feet, and the GT50 has a top speed of 15 MPH. 43 feet ©GSE TRAINING 2010
The units ID placard can be found on the left end of the instrument panel, facing the drivers door. Vehicle Data Plates ©GSE TRAINING 2010
ACCESS DOORS AND PANELS ©GSE TRAINING 2010
This tractor has the Martin 846 cab. Access Doors ©GSE TRAINING 2010
It has a rearward hinging door on each side of cab for access to the driving compartment. ©GSE TRAINING 2010
When you open the door, avoid striking yourself with the mirror. ©GSE TRAINING 2010
Access to the engine compartment is through two upward hinging covers on the top of the body work. ©GSE TRAINING 2010
Each cover has two latches. Lift the latch handle up (as shown), and turn 90º. ©GSE TRAINING 2010
A placard with service information may be found on the inside of the forward cover. ©GSE TRAINING 2010
A step on the right front fender and a hand grip on the cabin roof provides access to the engine compartment covers. ©GSE TRAINING 2010
Jack Points A jacking adapter is stowed inside one of the front wheel wells. ©GSE TRAINING 2010
The adapter fits into the cavity provided next to each wheel. ©GSE TRAINING 2010
With the adapter installed, an axle jack can be placed under the adapter to lift the vehicle. ©GSE TRAINING 2010
OPERATOR CONTROLS AND INDICATORS ©GSE TRAINING 2010
The operators instrument panel contains the following switches and indicator groups: Instrument Panel ©GSE TRAINING 2010
Indicators Illumination switches Start switch and warning lights ©GSE TRAINING 2010
The indicators consist of: ENGINE oil pressure gauge. The normal operating range is PSI. ©GSE TRAINING 2010
ENGINE coolant temperature gauge. Normally operates around 185° F. ©GSE TRAINING 2010
BATTERY, which is a voltmeter that indicates battery volts. Normally around 13 volts. ©GSE TRAINING 2010
FUEL GAUGE, which show the amount of diesel in the tank. ©GSE TRAINING 2010
ENGINE hour meter, the standard Hobbs meter which shows total running time of the engine. ©GSE TRAINING 2010
Switches consist of: The Engine Start Switch. ©GSE TRAINING 2010
With the Deutz engine: Set the engine switch to the RUN POSITION. The GLOW PLUG light above the switch will illuminate. ©GSE TRAINING 2010
When the glow plug light goes out, turn the switch to CRANK. When the engine starts, release the switch. It will return to the RUN position. ©GSE TRAINING 2010
HEADLIGHT switch. This two position toggle switch controls the headlights. ©GSE TRAINING 2010
The headlight and parking light. The headlights have no provision for high beam. ©GSE TRAINING 2010
PARKING LIGHT switch. This two position toggle switch controls the parking lights; the amber lights on the front, and the red combination lights on the rear. ©GSE TRAINING 2010
The white back-up light will illuminate when the transmission is placed in any reverse position. The red rear combination tail and brake light. ©GSE TRAINING 2010
The reverse warning horn, located inside this opening on the rear of the tractor, will also sound when the transmission is in reverse. ©GSE TRAINING 2010
HAZARD light switch. Turning this two position toggle switch on will flash the front amber parking lights and the red tail lights. ©GSE TRAINING 2010
PANEL LIGHT switch. This two position toggle switch turns on the instrument panel light. ©GSE TRAINING 2010
Panel light (arrow). ©GSE TRAINING 2010
STEERING MODE selector. This two position toggle switch controls the steering mode. ©GSE TRAINING 2010
The up position is COORD - for coordinated steering The down position is TRACK - for track steering ©GSE TRAINING 2010
With coordinated steering, the rear wheels will steer in a direction opposite to, and in proportion to, the direction the front wheels are steering. ©GSE TRAINING 2010
And track is simply front wheel steering only. ©GSE TRAINING 2010
EMERGENCY STEERING PUMP. This two position toggle switch turns on the emergency steering pump in the event the main pump fails. ©GSE TRAINING 2010
GENERATOR NO CHARGE - Warns the operator that the charging system is not operative. Warning lights consist of: ©GSE TRAINING 2010
HAND BRAKE ON - Warns the operator that the parking brake is set. ©GSE TRAINING 2010
ENGINE LOW OIL PRESSURE - Warns the operator that the engine oil pressure is below 5 PSI. ©GSE TRAINING 2010
ENGINE COOLANT TEMP OR LEVEL - Warns the operator the engine coolant is hotter than 185ºF, or level is too low for safe operation. ©GSE TRAINING 2010
BRAKE BOOSTER PUMP ON - Warns the operator that the brake booster pump is running. ©GSE TRAINING 2010
The TACHOMETER reads the engine RPM. It is located at the far left end of the panel, to the left of the steering wheel. ©GSE TRAINING 2010
At the far right end of the panel are the heater/defroster controls. Heater/Defroster controls ©GSE TRAINING 2010
At the top is the HEATER fan speed control. It allows the operator to select OFF or LOW, MEDIUM, or HIGH speeds. ©GSE TRAINING 2010
The heater and fan are inside this box under the drivers seat. The heater has a shutoff valve in the event it begins to leak. ©GSE TRAINING 2010
Below the HEATER switch are the WINDOW DEFROSTER pull knobs that control airflow to the front and rear windows. Pulling out these knobs turns on the fans that blow warm air across the windows. ©GSE TRAINING 2010
The front knob turns on the outboard fan (1), and the rear knob turns on the inboard fan (2) under the passengers seat. 2 1 ©GSE TRAINING 2010
Above the center of the panel, on the top of the dashboard, is a large red PARKING BRAKE ON light. This will illuminate any time the engine is running and the transmission is placed in forward or reverse while the parking brake is applied. This warns the operator to release the parking brake before moving the vehicle. ©GSE TRAINING 2010
The overhead switch panel carries auxiliary controls. Overhead switches consist of: Overhead Switch Panel ©GSE TRAINING 2010
BEACON LIGHT - Which turns on the amber beacon on the roof of the cab. ©GSE TRAINING 2010
Beacon light. ©GSE TRAINING 2010
HITCH LIGHT - Which turns on the work light on the front of the cab. ©GSE TRAINING 2010
Hitch light, normally pointed toward the ground to illuminate the work area around the front hitch. ©GSE TRAINING 2010
The mirror next to the hitch light allows the driver to view the hitch. ©GSE TRAINING 2010
FAN - Which turns on the two ventilation fans in the cab. ©GSE TRAINING 2010
Ventilation fans (defogger fans). ©GSE TRAINING 2010
FRONT WIPER - Which turns on the left front windshield wiper. ©GSE TRAINING 2010
FRONT WIPER - Which turns on the right front windshield wiper. ©GSE TRAINING 2010
The rear window wiper may have its own switch on the motor body (arrow). ©GSE TRAINING 2010
The cab has a dome light attached to the ceiling. It has its own switch. It may be turned on any time, regardless of the position of the ENGINE START switch. ©GSE TRAINING 2010
The transmission shift lever is located on a box between the seats. Transmission Shift Lever ©GSE TRAINING 2010
The Funk 2000 transmission has six forward speeds, and three reverse. The shift lever should always be placed in NEUTRAL (N), and the parking brake applied, prior to stopping the engine and leaving the vehicle. ©GSE TRAINING 2010
Directly behind the shift lever is a placard which explains the methods for towing the vehicle. ©GSE TRAINING 2010
To the right of the shift lever is the parking brake lever. Pull this lever up and back to set the parking brake. Parking Brake Lever ©GSE TRAINING 2010
The operators seat position can be adjusted. Moving the lever at the front edge of the seat (arrow) to the left will release the seat lock, allowing the operator to slide the seat fore and aft. Drivers Seat ©GSE TRAINING 2010
Lifting the lever on the right side of the seat near the floor will allow the operator to raise or lower the seat. ©GSE TRAINING 2010
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