Post
by DrLoch » Fri Jan 22, 2016 9:11 am
Here is one write-up that was done by jdemaris,
Speed of shift is a relatively easy adjustment. Pull the left floorboard out. There is a rubber plug there. pop the plug out and you will find a 5/16" nut on a threaded rod sticking straight upright. I use a 3/8 ratchet with a 1/2" deep socket on a short extension. To do it right you will need to put a gauge into the pressure tap hole. This is located between the steering levers on the cast top cover. There will be a " drum bung " there . remove the bung plug. Inside you will find a 1/8" pipe plug with a 3/16 allen head.I use a dab of grease on the allen when removing the plug. This plug is on an angle, pointing forward. Install a gauge with a 1/8 nipple . A 250 lb gauge will work fine.Adjust the pedal free-play to about 4 1/4" from top of pedal to where the throw out bearing just touches the clutch fingers. Put the 4 speed into the neutral position between 3rd and 4th gears.Lock the brakes down.Start the machine, ease out the clutch pedal to make sure the 4 speed is in neutral. You can now start adjusting the HLR speed of shift. I usually back off the adjustment till the pressure drops off a bit. Then I turn the adjustment in till the pressure goes to maximum psi. Turn it a bit more till the pressure just starts to drop off [ 5 to 10 lbs ]. You will be real close now. Try the speed of shift with the 4 speed still in neutral at about 1/2 throttle. The gauge will show a lag between high and reverse . when you have it close, put the 4 speed into 2nd gear and try it out. If it's still fast, turn the adjustment in 1/4 turn at a time till it's comfortable. It should just suck you out of the seat slightly going high to reverse . don't make it too " lazy " or too slow. This could cause overheating because of slippage. If it's too slow back off the adjustment 1/4 turn at a time. Usually when it's adjusted right, you can push the clutch pedal down 1/2" and the pressure gauge will show a slight increase in pressure . The book can be a little intimidating . Go with the above and you should be OK. If you don't feel confident doing it yourself , print this page and take it to your mechanic. Oh , the pressure should read 175 to 185 lbs. . If after doing adjustments the pressure isn't up to snuff, under the right floorboard is a rubber plug. Under the plug you will find a cap of the pressure control valve.[ A penny is good for about 12 to 15 lbs.]
Here is more
TESTING AND ADJUSTMENTS
Engine Clutch Assembly
1-Free Travel 3-Pedal Detent Adjusting
2-H-l-R linkage Stop Nut Screw
Fig. 1-Adjusting H-L-R Linkage
Whenever the clutch and H-L-R linkage have been removed, or clutch pedal free travel becomes less than 3.25 inch (88.9 mm) or whenever H-L-R shifts from high to reverse too aggressively, the linkage must be readjusted. Be sure to make both adjustments in the sequence given below.
First adjust clutch pedal free travel to 3.75 inch (95.3 mm) at the clutch pad as follows: Remove lett footrest from crawler. Observe detent set screw on clutch pedal arm on left side of clut,ch housing (Fig.
1). Loosen detent to increase free travel or tighten screw to decrease free travel. Always end up with screw in the detent (locked position).
Refer to Section 70, Group 25 and install pressure gauge as instructed at the bypass valve port in the accumulator housing through the access hole in the transmission top cover.
Turn H-L-R clutch valve stop nut down until clutch pedal just starts to pull away from stop, then back it out five turns.
With both gear shift and H-L-R levers in neutral and brakes locked, start engine and run at slow idle.
Turn the valve operating linkage stop nut (2,Fig. 1) clockwise until the pressure at the gauge just starts to drop.Then turn the nut in one additional turn.
NOTE: As the nut is turned, the pressure at the gauge will increase to approximately 160 psi (1103 kPa) (11 bar) maximum and then drop approximately
5 psi (35 kPa) (0.35 bar) as the nut is turned further.
Check the adjustment by depressing the pedal1/2 to 3/4 inch (12.7 to 19 mm). The pressure at the gauge should rise approximately 5 psi(35 kPa) (0.35 bar). If the 5 psi (35 kPa) (0.35 bar) requires more than 3/4 inch (19 mm) pedaltravel,turn nut counter clockwise. If 5 psi (35 kPa) (0.35 bar) is at less thatn
1/2 inch (12.7 mm) pedal travel, turn nut clockwise.
Depress clutch pedal and be sure that the pedal hits the firewall to prevent damage to the ctutcln adjusting lever.
H-L-R Transmission
The H-L-R oil pressure test and speed of shift adjustment are covered in Section 70,Group 25.
Check H-L-R linkage for wear. See Linkage Wear
Check in this section.
Proceed as follows to make the H-L-R lever adjustment:
1. Shift H-L-R lever (11, Fig. 47,page 40-10-28) in neutral detent (between high and reverse).
2. Hold H-L-R lever against back edge of slot in neutral lock (7, Fig. 46, page 40-10-27). Apply pres sure to take play out of neutral lock.
3. Starting with the H-L-R rod yoke (15, Fig. 47, page 40-10-28) adjust long. Shorten the H-L-R rod yoke until pin (8) slips through the yoke and pivot arm (22). Turn yoke 1/2 additional turn but not so short that the pin will not slide freely into yoke and pivot arm.
4. Install pin and cotter pin. Tighten the yoke jam nut.
Check H-L-R Linkage For Wear
70
20-7
To test H-L-R lever adjustment, proceed as follows:
1. With the H-L-R control lever locked in neutral and the speed selector lever in the 4th position, depress the clutch pedal and start the engine.
2. Make certain the area around the crawler is cleared to allow some travel of the machine.
3. Adjust the engine throttle lever to obtain an engine speed of approximately 1900 rpm.
4. While holding the foot brake firmly and with the clutch fully depressed,lift the H-L-R neutrallock and shift the lever to reverse.
5. With the brake pedal firmly depressed, slowly release the clutch pedal to such a degree that the engine starts to load in reverse.
6. Again fully depress the clutch pedal and move the H-L-R control lever toward neutraljust far enough that the neutral lock can be placed over the lever in the locked position. Now slowly release the clutch pedal to its maximum engaged position.
NOTE: If the crawler begins rearward movement while releasing the clutch pedal, shut the engine off, recheck the adjustment of the linkage and if necessary, adjust the linkage yoke an additional 112 turn clock wise. Retest as outlined in steps 1 through 6 of the testing procedure.
7. After establishing that the unit will not operate rearward with the lever locked in neutral, repeat the testing procedure (steps 1 through 6) from the high to neutral position and readjust as required until no movement of the crawler can occur in either direction with the H-L-R lever locked in neutral.
With H-L-R valve in neutral detent, H-L-R lever has some movement before linkage moves valve arm out of neutral detent. This movement increases as pivot points in linkage wear or yoke nut is not tight.
1. Place H-L-R lever in neutral position.
2. Apply slight amount of rearward pressure on lever holding it against detent. Mark location of lever on quadrant. Apply slight amount of forward pressure on lever holding it against opposite side of detent. Mark location of lever on quadrant. Use same spot on lever for both markings.Measure distance between the two marks.If distance is less than 0.5 inch (12.7 mm), linkage wear is not a problem.
3. If distance is 0.5 inch (12.7 mm) or more,inspect control rod pivot pin, control rod yoke, and pivot pin for wear. One or more of these wear points must be repaired to bring control linkage free travel under 0.5 inch (12.7 mm). Be sure jam nut is tight.
Getting the pressure correct is important.
450C Track Loader
291457T
