Howdy Everyone! This blog is to help those with questions on how to fix things on their John Deere equipment whether it is Ag Equip or Construction as well as other brands of equipment.
Wednesday, April 10, 2013
317/320 Skid Steer Low Oil Pressure
Complaint or Symptom :
4024 / 5030 Engine has low or no oil pressure.Problem or Situation :
Machine or engine is observed to have low or no oil pressure. When engine is warm, oil pressure in the main galley should be at minimum 15 PSI at Low Idle and around 50 (+ 15) PSI at Rated Speed, Full Load. Check oil pressure by removing a small pipe plug on left side of engine and insert pressure gauge.
When the engine is cold, oil pressure in the cold start galley should be at minimum 35 PSI at Low Idle and at least 65 PSI at High Idle. Check oil pressure by removing a small pipe plug on right side of engine and insert pressure gauge.
Solution :
1. Check engine oil level with the machine on a level surface. If low add appropriate amount of oil to bring level up to recommended level.2. Remove front governor access cover. Use a mirror to inspect fuel rack retaining plate for the hardened roll pin.
Also, note the amount of vertical movement at the front of the rack. If pin is in the plate, rack may have 0.5 millimeters vertical travel; if pin is missing, rack may have up to 2 millimeters vertical travel. If pin is missing
remove timing gear cover and inspect oil pump for damage from the roll pin. Cases have been reported in the field where the hardened roll pin falls out, gets sucked into the oil pump, and damages the oil pump. If oil pump checks out OK, replace fuel rack per CTM301 (Which is a very lengthy and delicate process that should only be done in a certified John Deere Shop) and MAKE SURE the pin is located before engine re-assembly (or catastrophic failure could occur).
3. With timing gear cover off remove oil pressure regulating valve (PRV).
Is the PRV spring broken? If yes, replace PRV per CTM301. Make sure to use JDG1721-1 when installing PRV plug as this tool stakes the bore to ensure proper plug installation.
4. Inspect oil galleys for missing or improperly installed plugs. Check pipe plugs on both sides of the engine (see pics above for right and left) and galley plugs on both ends of the engine
If any plugs are missing or damaged proceed with repair.
Photos and Information Courtesy of John Deere DTAC Solutions
317/320 Skid Steer doesn't drive straight
Complaint:The wheels on one side of the machine will not come back up to full speed after slowing them down to make a steering adjustment. This occurs most frequently when traveling down hill, but has also happened on level ground.
Problem or Situation:
John Deere has found that this was a typical situation on a 317 and 320 and is caused by the hot oil shuttle (flushing valve) moving to the reverse direction when slowing the wheels and sticking in that position. This allows some of the drive pressure oil to leak past the shuttle, reducing the forward wheel speed until the flushing valve shifts back to the forward direction.Solution:
The former flushing valve used 6-bar springs. It has been determined that this pressure is too low. A new 10-bar flushing valve assembly is now available to correct this problem. The 10-bar flushing valve assemblies were being installed in all production motors as a running change. Serial number breaks for this change were captured in the appropriate parts catalogs.
The part number for the 10-bar flushing valve assembly is T223651. This shuttle valve replaces the 6-bar shuttle valve assembly T208293.
THIS IS VERY IMPORTANT: The flushing valves must be matched side-to-side. You cannot have a 6-bar flushing valve on one side and a 10-bar valve on the other side. After the 10-bar shuttle valve is placed in production, all service part drive motors will be equipped with the 10-bar shuttle valve. You will not be able to purchase a 6-bar shuttle valve motor. Therefore, if you are replacing a drive motor that was built before the 10-bar shuttle valve was introduced, the shuttle valve in the remaining motor must be replaced with T223651 to ensure that both motors are equipped with 10-bar shuttle valves.
The flushing valve kits will be provided by your dealership but you have to order them. If Installation Instructions are not included with the kits, use the procedure below to replace the flushing valve.
1. Remove the plug (151Z0366), both springs (663X6251), spool (151Z0368), and lower guide (151Z0367) from the end plate of the motor.
NOTE: Be sure that the lower guide (151Z0367) is removed from the end plate. Failure to remove the lower guide will prevent the spool from properly seating in the end plate and will cause plug leakage.
2. Discard all of the parts removed in step 1.
3. Install the springs (663X6253), plunger (151Z0424), and plug (151Z0422) into the end plate of the motor. Torque the plug to 30 Nm (22 ft. lbs).
4. Repeat steps 1-3 for the remaining motor (if both motors are being worked).
5. Start the machine and check for leaks.
Courtesy of John Deere DTAC Solutions
Subscribe to:
Posts (Atom)