OK. I'm guided by sis now. Tests and adjustments. Will make this section in the test .. Test 13.Make sure center pedal adjustment is correct. The bolt must go through the hole in the lever into the threaded hole in the valve. In the BRAKES OFF position, check the pressure to the top left plug in the main control valve.
A. If the pressure is greater than 860 kPa (125 psi), check for debris blocking the operate / brake spool.
B. If the pressure is less than 860 kPa (125 psi), from the following.
* Back flush hole. (See LOADER WILL NOT MOVE; PLUGGED ORIFICE IN MAIN CONTROL VALVE CAN BE BACK-FLUSHED in the Troubleshooting and Service Tips section of this publication.) * If this does not solve the problem, of Test 14 ..
I do this test. And in the left cap I have a pressure of 250 psi .. and charge pressure around 220.psi.
answer: A. If the pressure is greater than 860 kPa (125 psi), check for debris blocking the operate / brake spool.
I remove the spool in the main control valve without removing the body. And I get this.
speed-brake control stem Has been hit twice. I guess in an attempt to move her back. Maybe they thought she was stuck and beat her with an iron.
Now my question for you is. Does that hole drain oil? Because when blowing with my mouth does not enter or leave air. Is covered The blows have deformed it internally. Since it is as fine as a needle. I ask this question because in the hydraulic scheme does not seem to play a role there. I watched.
another thing. In the diagram there is talk of a hole 54. That hole is the one that is hit. ? Or speak of the hole start vent spool left? read this paragraph. As before, the oil from the servo relief valve is sent through external line (51) to replenish the drive circuits. The oil is also sent through charge pressure check valve (24), past the operate/brake spool and start/vent spool, to the pilot valve. When pilot valve spool (55) was in PARK, charge pressure oil was directed back to the start/brake spool to fill the chamber at the right end. The pressure in the chamber caused the start/brake spool to move to the left (position shown). With the start/vent spool in this position, the supply of charge pressure oil from the charge check valve is now sent back to the operate/brake spool where the flow divides. Part of the oil goes through tube (52) to reset the drive loops. The remainder goes through orifice (54) to the chamber at the left end of operate/brake spool (21) and to a chamber in pilot valve (5). When the pilot spool was in PARK, the chamber in the pilot valve was open to tank. This prevented the pressure from increasing in the chamber at the left end of the operate/brake spool. When the pilot spool is moved to BRAKES OFF (in either forward or reverse), the tank passage in the pilot valve is blocked. The pressure in the chamber at the left end of the operate/brake spool will now increase, causing the spool to move to the right. The spool will move until it makes contact with the end cover on the valve body (position shown). The spool is now in a position to send pressure oil through the brake line and to block the flow of upstream oil from the quick-response valve to the top of the underspeed valve, the chamber around the quick-response spool, the underspeed override valve and the spring chamber of the overspeed valve.