1900 YRM 1136 NOTE: Be sure to count and note the number of turns on the jam nut. 2. Using an allen wrench, hold the flow compensator adjustment screw and turn the jam nut counterclockwise all the way. 3. Turn the flow compensator adjustment screw clockwise until it stops.
WARNING DO NOT operate the hydraulic functions while adjusting the pressure compensator. Serious injury to personnel and damage to the lift truck can result if hydraulic functions are operated. 4. Start lift truck engine and let it idle. DO NOT operate the hydraulic functions. Measure the pressure at the P-port of the SCU. See Figure 32. If pressure does not match what is shown in Table 8, adjust the pressure compensator as follows:
Variable Displacement Pump Checks and Adjustments Table 8. Pressure Compensator Adjustment Lift Truck Model
Pressure
GLP/GDP20-35VX (B875)
239 ±3 bar (3466 ±44 psi)
GLP/GDP40VX5/VX6, GLP/GDP45SVX5, GLP/ GDP45VX6, GLP/ GDP50-55VX (GP/GLP/ GDP080, 090, 100, 110, 120VX) (G813, H813, J813)
226 ±3 bar (3278 ±44 psi)
5. Put the pressure compensator adjustment screw back to its original position by turning the adjustment screw counter clockwise by the number of turns noted earlier. 6. Tighten jam nut on pressure compensator adjustment screw to 21 N•m (186 lbf in).
a. Turn pressure compensator adjustment screw clockwise to increase pressure by 50 bar (725 psi) per turn.
7. Put the flow compensator adjustment screw back to its original position by turning the adjustment screw counter clockwise by the number of turns noted earlier.
b. Turn pressure compensator adjustment screw counter clockwise to decrease pressure by 50 bar (725 psi) per turn.
8. Check the margin pressures as described in Margin Pressure Check. 9. If margin pressure is correct, tighten the flow compensator jam nut to 21 N•m (186 lbf in). If margin pressure is not correct, adjust margin pressure as outlined in Margin Pressure Check.
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