700 SRM 1123 Cooling System Checks General This section contains the repair and replacement in- structions for the radiator, coolant level sensor, fan assembly (pusher type), fan shroud, coolant hoses, coolant recovery bottle, and optional debris screen. Cooling System Checks EXHAUST LEAKS INTO COOLING SYSTEM WARNING During engine operation, be careful not to touch the fan, pulleys, or drive belts. Contact with these parts can cause serious injury. To check for exhaust leaks into the cooling system, use a Combustion Leak Test Kit for this purpose. Fol- low the manufacturer’s instructions when doing the test. WATER FLOW RESTRICTIONS IN RADIATOR WARNING During engine operation, be careful not to touch the fan, pulleys, or drive belts. Contact with these parts can cause serious injury. To check for water flow restrictions in the radiator, run engine until it is warm. WARNING The radiator or other parts of the cooling sys- tem may be hot or under pressure and can cause serious injury. Wait 30 minutes for the radiator to cool. Do a touch test by touching the radiator with your hand. If the radiator is still hot to the touch, wait another 30 minutes before attempting to check or fix any part of the cooling system. Shut engine OFF and feel the radiator. The temper- ature must be even across the radiator. (The radiator will be hotter near the top radiator hose.) Cold spots on radiator indicate restrictions. If radiator has leaks, either replace the radiator or have it repaired by trained personnel. RADIATOR HOSES WARNING The radiator or other parts of the cooling sys- tem may be hot or under pressure and can cause serious injury. Wait 30 minutes for the radiator to cool. Do a touch test by touching the radiator with your hand. If the radiator is still hot to the touch, wait another 30 minutes before attempting to check or fix any part of the cooling system. Inspect all radiator hoses. If they feel spongy or have visible cracks, replace hoses. WATER PUMP WARNING During engine operation, be careful not to touch the fan, pulleys, or drive belts. Contact with these parts can cause serious injury. WARNING The radiator or other parts of the cooling sys- tem may be hot or under pressure and can cause serious injury. Run engine until it is warm. Check the operation of water pump by holding the top radiator hose. If the pump is operating, there will be pressure surges in the hose. Check for leaks around the timing belt cover near the base of the oil pump. Check the weep hole where water can drain by the oil filter. If there is a drip, check the pump shaft seal and water pump. Replacement of the pump shaft seal or water pump may be necessary. 1
Flushing the Cooling System 700 SRM 1123 For repair procedures for the GM 2.4L water pump, refer to the section GM Engine Repair, GM 2.4 Liter Engine 600 SRM 1121. For repair procedures for the Mazda 2.0L and 2.2L water pump, refer to the section Mazda Engine, 2.0L and 2.2L 600 SRM 1122. For replacement procedures for the Yanmar 2.6L and 3.3L water pump, refer to the section Yanmar Diesel Engines, 2.6L and 3.3L 600 SRM 1205. For replacement procedures for the GM 4.3L water pump, refer to the section GM Engines, 4.3 Liter V-6 600 SRM 1251. For repair procedures for the Cummins 4.5L and QSB 3.3L water pump, contact your local Hyster dealer or see Hyster Hypass Online. Flushing the Cooling System COOLING SYSTEM, CLEAN WARNING Compressed air can move particles so that they cause injury to the user or to other personnel. Make sure the path of the compressed air is away from all personnel. Wear protective gog- gles or a face shield to prevent injury to the eyes. WARNING The radiator fins on the radiator are very sharp and can cause serious injury. Wear gloves while checking the radiator fins. 1. Check radiator fins. Clean exterior of radiator with compressed air or water as needed. WARNING DO NOT remove the radiator cap from the radi- ator when the engine is hot. When the radiator cap is removed, the pressure is released from the system. If the system is hot, the steam and boiling coolant can cause burns. WARNING The radiator or other parts of the cooling sys- tem may be hot or under pressure and can cause serious injury. Wait 30 minutes for the radiator to cool. Do a touch test by touching the radiator with your hand. If the radiator is still hot to the touch, wait another 30 minutes before attempting to check or fix any part of the cooling system. CAUTION Disposal of lubricants and fluids must meet lo- cal environmental regulations. 2. Drain cooling system. Fill cooling system with clean water. See the Radiator, Remove for Lift Trucks Models S30FT, S35FT, S40FTS (E010); H1.6FT, H1.8FT, 2.0FTS (H30FT, H35FT, H40FTS) (F001); S2.0-3.5FT (S40-70FT, S55FTS) (F187); H2.0-3.5FT (H40-70FT) (L177), S4.0, 4.5, 5.5FT, S5.5FTS, (S80, 100, 120FT; S80, 100FTBCS; S120FTS; S120FTPRS) (G004) and H4.0FT5/FT6; H4.5FTS5, H4.5FT6; H5.0-5.5FT (H80, 90, 100, 110, 120FT) (N005, P005) section for more information. 3. Drain cooling system. Fill cooling system with clean water. See the Radiator, Remove for Lift Truck Models S6.0FT, S7.0FT (S135FT, S155FT) (D024, E024) and see Radiator, Remove for Lift Truck Models H6.0FT, H7.0FT (H135FT, H155FT) (H006, J006) section for more informa- tion. 4. Install radiator cap. Run engine until top radia- tor hose is hot. Stop engine and let engine cool. 2
700 SRM 1123 Radiator Replacement 5. Drain water from radiator. If water is dirty, fill system with water and repeat procedure until water is clean. CAUTION Follow the manufacturer’s instructions when using a chemical radiator cleaner. 6. If water does not clean system, use a chemical radiator cleaner. CAUTION Follow the manufacturer’s instructions when using special equipment to reverse clean the radiator. 7. If radiator or cooling system is very dirty or has a restriction, use reverse cleaning method. This method uses water pressure to force water through radiator in opposite direction of normal flow. CAUTION Additives may damage the cooling system. Be- fore using additives, contact your local Hyster dealer. 8. Fill cooling system with a mixture of 50 percent water and 50 percent ethylene glycol boron-free antifreeze. The 50/50 mixture will protect cool- ing system to 37 C( 35 F). Add coolant as nec- essary to keep level between the ADD and FULL marks on the reservoir. Radiator Replacement RADIATOR, REMOVE FOR LIFT TRUCKS MODELS S30FT, S35FT, S40FTS (E010); H1.6FT, H1.8FT, 2.0FTS (H30FT, H35FT, H40FTS) (F001); S2.0-3.5FT (S40-70FT, S55FTS) (F187); H2.0-3.5FT (H40-70FT) (L177), S4.0, 4.5, 5.5FT, S5.5FTS, (S80, 100, 120FT; S80, 100FTBCS; S120FTS; S120FTPRS) (G004) AND H4.0FT5/FT6; H4.5FTS5, H4.5FT6; H5.0-5.5FT (H80, 90, 100, 110, 120FT) (N005, P005) WARNING The radiator or other parts of the cooling sys- tem may be hot or under pressure and can cause serious injury. Wait 30 minutes for the radiator to cool. Do a touch test by touching the radiator with your hand. If the radiator is still hot to the touch, wait another 30 minutes before attempting to check or fix any part of the cooling system. 1. Turn OFF truck. 2. Remove the hood and seat combination. See the section Frame 100 SRM 1120 for S30FT, S35FT, S40FTS (E010); H1.6FT, H1.8FT, 2.0FTS (H30FT, H35FT, H40FTS) (F001); S2.0-3.5FT (S40-70FT, S55FTS) (F187); H2.0-3.5FT (H40-70FT) (L177) lift trucks, and Frame 100 SRM 1243 for S4.0, 4.5, 5.5FT; S5.5FTS (S80, 100, 120FT; S80, 100FTBCS; S120FTS, S120FT- PRS) (G004) and H4.0FT5/FT6; H4.5FTS5, H4.5FT6; H5.0-5.5FT (H80, 90, 100, 110, 120FT) (N005, P005) lift trucks. WARNING Always disconnect the cable at the negative terminal first. Install a tag on the battery ter- minals so that no one connects the cables on the terminals. 3. Disconnect the negative battery cable. 4. Disconnect the positive battery cable. WARNING DO NOT remove the radiator cap from the radi- ator when the engine is hot. When the radiator cap is removed, the pressure is released from the system. If the system is hot, the steam and boiling coolant can cause burns. 5. Let coolant cool to ambient temperature. Place a drain pan with a capacity greater than the capac- ity of the cooling system under radiator. Remove radiator cap. 3
Radiator Replacement 700 SRM 1123 CAUTION Disposal of lubricants and fluids must meet lo- cal environmental regulations. 6. Open the drain plug or disconnect the bottom ra- diator hose. 7. Lift trucks equipped with a Cummins QSB 3.3L diesel engine: Loosen clamps and disconnect the charge air cooler hoses from radiator. See Fig- ure 4. 8. Cap radiator hoses. 9. Disconnect hose to auxiliary coolant reservoir and remove reservoir. 10. Remove battery and battery tray. 11. Disconnect electrical connector to the coolant level sensor. NOTE: For Mazda LPG engine, the LPG converter bracket needs to be moved for clearance of radiator. 12. Remove screws from the radiator shroud and move shroud out of the way. 13. Remove fan, fan spacer, and pulley. 14. Remove upper radiator bracket. See Figure 1 for S30FT, S35FT, S40FTS (E010); H1.6FT, H1.8FT, 2.0FTS (H30FT, H35FT, H40FTS) (F001); S2.0-3.5FT (S40-70FT, S55FTS) (F187); H2.0-3.5FT (H40-70FT) (L177) lift trucks. See Figure 2 for S4.0, 4.5, 5.5FT, S5.5FTS, (S80, 100, 120FT; S80, 100FTBCS; S120FTS; S120FTPRS) (G004) lift trucks. See Figure 3 for H4.0FT5/FT6; H4.5FTS5, H4.5FT6; H5.0-5.5FT (H80, 90, 100, 110, 120FT) (N005, P005) lift trucks. See Figure 4 for truck equipped with a Cummins QSB 3.3L H4.5FT5/FT6; H4.5FTS5, H4.5FT6; H5.0-5.5FT (H80, 90, 100, 110, 120FT) (P005), S6.6FT, S7.0FT (S135FT, S155FT) (E024), and H6.0FT, H7.0FT (H135FT, H155FT) (J006). 15. Remove radiator from truck. 16. If necessary, remove the coolant level sensor. Legend for Figure 1 A. RADIATOR WITH EXTERNAL COOLER B. RADIATOR WITH INTERNAL COOLER, MODINE SHOWN 1. RADIATOR 2. CAP 3. UPPER HOSE 4. LOWER HOSE 5. CLAMP 6. SHROUD 7. CLIP 8. WASHER 9. SCREW 10. CLIP 11. UPPER BRACKET 12. CAPSCREW, S2.0-3.5FT (S40-70FT, S55FTS) [F187] 13. INSERT 14. LOWER BRACKET, S2.0-3.5FT (S40-70FT, S55FTS) [F187] 15. NUT-CLIP, S2.0-3.5FT (S40-70FT, S55FTS) [F187] 16. ISOLATOR 17. COOLANT LEVEL SENSOR 18. RESERVOIR 19. TUBE 20. OUTLET ASSEMBLY 21. HOSE 22. RESERVOIR OUTLET 23. CAP 24. BUSHING 25. SCREEN ASSEMBLY (OPTIONAL) 26. HEAT SHIELD 27. RESERVOIR BRACKET 28. HEAT SHIELD, H2.0-3.5FT (H40-70FT) [L177] 4
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