TM 10-3930-653-14&P TROUBLESHOOTING GUIDE (1) Flow Valve Problem Possible Cause Remedy Handwheel  is  caught Flow control valve spool catches Disassemble, repair or re- when rapidly turned. place Flow control valve spool worn Replace as assembly. Oil pressure  does not Relief valve opened Replace as assembly. rise. Oil pressure higher than Relief valve closed Replace as assembly. relief set pressure Noise of relief valve Relief valve vibrating Replace as assembly. Too high oil tempera- Relief valve closed Replace as assembly. turn Heavy handwheel oper- Relief valve opened Replace as assembly. ation while idling Flow control valve spool catches Disassemble and repair or replace. Flow control valve spool worn Replace as assembly. Varying  steering force Relief valve vibrating Replace as assembly. Flow control valve spool catches Disassemble and repair or replace. Flow control valve spool worn Replace as assembly. Heavy handwheel oper- Relief valve opened Replace as assembly. ation Flow control valve spool catches Disassemble and repair or replace. Flow control valve spool worn Replace as assembly. MAINTENANCE SERVICE DATA (1) Flow Valve Checking Item Standard Value Service Limit Spool to valve body clearance 10 to 20 u More than 30 ,u 7.12 kg ( 15.7 Ibs)/ Less than 64 kg Flow control spring 26 mm (1.02  ) Less than 6.4kg (14.1 lbs) o.a.  length (2) Power Cylinder Unit: mm(in) Checking Item Standard Value Service Limit 0.011 to 0.113  0.150 Piston rod to box clearance (0.000433 to 0.000445 In) (0.0059) 4-241 (Page 4-242 blank)