SECTION 1 — INTRODUCTION SR 1900 DELUXE CAB OPTIONS The SR 1900 Deluxe Cab is available with two levels of environmental control that provide additional comfort and convenience for the Operator, and add additional functionality to the machine. An optional cab heater is available which includes a pressurized cab with an external air fi lter.
Take precautions to prevent hair, jewelry or loose clothing from becoming caught in moving parts. Close and secure all doors, covers and access panels as shown in the SR 1900 Instructions For Use before using the machine. Do not clean the cab with a pressure washer. We recommend hand-washing the cab using normal “garden hose” water pressure.
ICE TM-08-HD, 5 cu. in. (82.0 cc) per revolution, 700-6000 RPM Sauer-Danfoss p/n 121.20.045.00, 1.02 cu. in. (16.7 cc) Compressor Motor displacement Heating System Capacity 20,000 BTUs/hr. Air Conditioning System Capacity 13,000 BTUs/hr. FIGURE 1-1 – SR 1900 Cab Height FORM NO. 56043123 - SR 1900 - 3...
SECTION 2 — KNOW YOUR MACHINE CAB CONTROLS Refer to Figure 2-1. Cooling Fan Switch Dome Light Heater A/C Fan Switch Heater Temperature Control A/C On/Off Switch Windshield Wiper Switch FIGURE 2-1 – Cab Controls 4 - FORM NO. 56043123 - SR 1900...
Filter in warm water for 15 minutes, rinse with clean water (40 psi max. water pressure), then air-dry (don’t use compressed air). Make sure the Filter is completely dry before reinstalling. Reinstall the Filter and Cab Filter Cover, then reinstall and tighten the four screws. FIGURE 3-1 – Cab Filter FORM NO. 56043123 - SR 1900 - 7...
GENERAL SYSTEM OVERVIEW The SR 1900 cab heating system uses an electronic Heater Control Assembly (15) to direct the appropriate amount of engine coolant to the Heater Core (9) in the Heater Air Box Assembly (10). The Blower Assembly (8) in the Heater Air Box Assembly blows fi ltered air through the Heater Core to provide warm air to the cab.
Motor M6. Is there continuity through the load contacts on K8 Replace the relay. (terminals 30 and 87) when the coil is energized? Check the connectors and wiring and repair as necessary. FORM NO. 56043123 - SR 1900 - 9...
Feedback Pin resistance values are not close to those shown in the above table, it indicates that the feedback potentiometer in the Valve Assembly is not working correctly. Replace the Valve Assembly. 10 - FORM NO. 56043123 - SR 1900...
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Install the replacement Heater Temperature Control on the Overhead Control Plate. Splice the original wires from the Valve Assembly to the replacement Heater Temperature Control using butt connectors and heat-shrink insulation. Reinstall the Overhead Control Plate in the cab. FORM NO. 56043123 - SR 1900 - 11...
Air locks (air bubbles) in the cooling system can prevent normal coolant fl ow to the heater core. One factor that can contribute to the formation of air locks is the fact that the heater cores in the SR 1900 cabs are the highest point in the machine’s cooling system. This can make it diffi cult to purge the air from the system using traditional methods more common to the automotive industry.
General System Overview The SR 1900 cab air conditioning system uses a Hydraulic Compressor Motor (22), powered by the Gear (Accessory) Hydraulic Pump (28), to run the A/C Compressor (21). The A/C Compressor compresses the refrigerant and transfers the hot, high-pressure refrigerant gas to the A/C Condenser (18) at the rear of the machine which condenses the refrigerant gas into a liquid.
The control side (coil) of the Compressor Hydraulic Valve L10 must be connected to battery negative (BLK wire). The control side (coil) of the HVAC Relay K8 must be connected to battery negative (BLK wire). 14 - FORM NO. 56043123 - SR 1900...
Motor M9 and/or Is there continuity through Replace the Relay. M10. the load contacts on K8 (terminals 30 and 87) when the coil is energized? Check the connectors and wiring and repair as necessary. FORM NO. 56043123 - SR 1900 - 15...
Hopper down)? Check the auxiliary pump, Is the hydraulic pressure at the Check the compressor and air compressor motor and related auxiliary pump test port within conditioning system components. hydraulics. specs? 16 - FORM NO. 56043123 - SR 1900...
If you don’t observe differences in the hydraulic pressures similar to those in the above chart when switching the A/C on and off, it could indicate a problem with the Hydraulic Valve (L10), the Accessory Hydraulic Pump or the A/C compressor motor. FORM NO. 56043123 - SR 1900 - 17...
Compressor Relay and repair/replace as necessary. If there is very high resistance or no continuity across terminals 30 and 87a, replace the Compressor Relay. FIGURE 5-2 – Compressor Relay Compressor Relay (K10) 18 - FORM NO. 56043123 - SR 1900...
If there is very high resistance or no continuity across the terminals, replace the Binary Pressure Switch. FIGURE 5-3 – Checking Continuity through the Binary Pressure Switch Binary Pressure Switch (S34) A/C Receiver/Dryer FORM NO. 56043123 - SR 1900 - 19...
Thermostat should open and you should read an open circuit through the terminals with the probe below 31° F. Once the probe warms up to 39.5° F, there should again be continuity through the Thermostat terminals. FIGURE 5-4 – Checking Continuity through the Thermostat Thermostat (S33) 20 - FORM NO. 56043123 - SR 1900...
HEATING AND A/C SYSTEM PLUMBING AND HYDRAULIC FLOW SCHEMATIC Heater Core AC Evaporator Radiator Coolant Tube Feed Hot Water Return Flow Heater Control Valve Hydraulic Test Port Low Pressure Refrigerant (Gas) High Pressure Gas High Pressure Liquid FORM NO. 56043123 - SR 1900 - 23...
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