PROBLEM - TM-5-3805-260-24

TM-5-3805-260-24 Scraper Tractor: Elevating Self-Propelled 11 Cubic Yard Sectionalized and Nonsectionalized Manual
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TM 5-3805-260-24 PROBLEM PROBABLE CAUSE RECOMMENDED CORRECTIVE ACTION Machine steers slowly in both directions. 1. Valve spool does not move enough. 2. Relief valve setting is too low. 3. Failure or damage of pilot valve or flow control valve. 4. Pump output is low. 5. Failure of a piston seal in the steering cylinders. a. Check valve spool, repair or replace as necessary. b. Check relief valve setting, adjust as necessary. c. Replace pilot valve/flow control valve. d. Check pump, repair or replace as necessary. e. Check piston seals in the steering cylinders, repair or replace as necessary. Machine turns slowly in one direction. Valve spool does not move enough in one direction (spool not centered). Check spool and adjust or replace as necessary. Steering is not smooth (jerky). 1. Air in the hydraulic oil. 2. Relief valve setting is low. a. Bleed the hydraulic oil lines. b. Check relief valve, adjust or replace as necessary. Machine turns correctly when roading (moving), but is slow in both directions when the machine turns against a load (high resistance). 1. Leakage past relief valve seat or seals. 2. The fit of the flow control valve in the bore is not correct. a. Check relief valve setting, valve seats and seals, replace as necessary. b. Inspect flow control valve spool and bore, replace as necessary. PROBLEM PROBABLE CAUSE RECOMMENDED CORRECTIVE ACTION Machine turns slowly, even when the steering wheel is in NEUTRAL. 1. Mechanical linkage for steering does not move freely. 2. Valve spool does not move freely (is stuck). 3. Valve spool in control valve is not adjusted correctly (not centered). a. Check linkage, repair or replace as necessary. b. Check spool, adjust or replace as necessary. c. Check spool adjustment, repair or replace as necessary. The oil pressure is low. 1. The relief valve setting is low. 2. The pump has too much wear. 3. The failure of a seal in the system. a. Check relief valve setting, adjust as necessary. b. Check pump, repair or replace as necessary. c. Check seals in system, replace as necessary. The oil temperature is too high. 1. The viscosity of the oil is wrong. 2. The relief valve setting is too low. 3. Loose connection of the oil line on the inlet side of pump. 4. The pump has too much wear. a. Replace with oil of the proper viscosity. b. Adjust relief valve as necessary. c. Secure connection. d. Check pump, repair or replace as necessary. 5. Jumper hose to load transfer valve (on right side of tractor near fender) not in place. 2-112

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