TM 5-3805-262-207. AIR HORN.Located in hydraulic reservoir area. Controlled by horn valve locatedon cab deck. Part of pneumatic system. Refer to page 1-26 for description.8. CAB HEATER SYSTEM.Located in cab console. Consists of heater valve, heater fanswitch, and resetable 3 ampere circuit breaker mounted on cab console panel andheater core and heater fan motor mounted within console, Hot coolant from enginecylinder block flows through heater core and returns to engine. Heater fan motorblows air over heater core where it is warmed and exhausted over cab deck. Coolantflow to heater core controlled by heater valve. Heater fan motor controlled bypush-pull heater switch .1-31. HYDRAULIC SYSTEMSee figure FO-11HYDRAULIC PUMP.Two section pump. One section provides hydraulic power for steerings y s t e m ; o t h e r s e c t i o n p r o v i d e s p o w e r f o r l o a d e r s y s t e m . M o u n t e d o n r e a r o f , a nddriven by, transmission. Steering section provides 23 gallons per minute flow at2200 rpm at 2000 psi; loader section provides 52 gallon per minute flow at 2200 rpmat 2500 psi.CONTROL VALVE.Three spool valve with open center passage. Open center passagestarts at inlet port of control valve and stops at outlet port. Return oil from cyl-inders flows to output port through return passages in top and bottom. Supply pas-sage starts at inlet port and stops at bucket spool. This supply passage permitsoperation of bucket and clam cylinders at same time. Cylinders with least amount of resistance will move first. When clam or bucket spool actuated, oil flow to liftspool stopped. Lift cylinders will not move until both clam and bucket spools arereturned to neutral position. Load check valves connected between open center pas- sage and A and B ports for each spool, Load check valves prevent reverse flow of oilbetween cylinders and control valve as a spool is moved into a power position. Two circuit relief valves used: one each connected between A and B ports and returnpassage for bucket and clam spools. Circuit relief valves protect circuits when acylinder is made to move with spools in neutral. Adjustable main relief valve loca-t e d a t i n l e t o f c o n t r o l v a l v e . I f p r e s s u r e a t i n l e t r e a c h e s s e t t i n g o f m a i n r e l i efvalve while a spool is activated, main relief valve opens to protect hydraulicsystem.CONTROL LEVERS AND LINKAGES.Position control valve spools allowing high pressureh y d r a u l i c o i l t o a c t i v a t e c y l i n d e r s . C o n n e c t e d b y r i g i d r o d s t o c o n t r o l v a l ves p o o l s.TILT CYLINDER ASSEMBLY.Two used. Activated by control valve. Tilt bucket assembly forward or rearward.LIFT CYLINDER ASSEMBLY.Two used. Activated by control valve. Raise or lower bucketassembly.BUCKET CLAMSHELL CYLINDER. Two used. Activated by control valve. Open or close buck-et clam.HYDRAULIC RESERVOIR.P a r t o f f r o n t c h a s s i s a s s e m b l y . L o c a t e d b e h i n d f r o n t a c c e s s door. Capacity is 17 gallons. Return oil filtered by 10 micron filter. Oil fillercap located at top of reservoir; sight gage located at bottom front. Filter screenlocated at bottom of reservoir in suction line .1-29
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