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4.
Rotate the control valve handle to the neutral ("3") position.
See Figure 11 for VM33 and VM43 valve positions. See
Figure 12 for VM33M and VM43M valve positions.
5.
Start the pump and allow the oil to warm.
6.
Rotate the control valve handle to the advance ("1") position.
Allow pressure to build.
7.
To increase pressure: SLOWLY turn the relief valve set screw
clockwise until pressure increases to the desired setting.
NOTE: An internal check valve in the manifold will prevent
the pressure from dropping when the set screw is turned
counter-clockwise. To lower the pressure setting, follow the
procedure in steps 8a through 8e.
8.
To decrease pressure:
a.
Be sure the pump is running.
b.
Rotate the control valve handle to the neutral ("3")
position to relieve pressure on the "A" port.
c.
Turn the relief valve set screw counter-clockwise one
turn.
d.
Rotate the control valve handle to the advance ("1")
position.
e.
SLOWLY turn the relief valve set screw clockwise until
pressure increases to the desired setting.
9.
When the desired pressure setting is reached, lock the set
screw with the locknut. DO NOT overtighten.
10. Before turning off pump, rotate the control valve handle
momentarily to the retract ("2") position to relieve pressure
at the "A" port. Then, rotate the handle to the neutral ("3")
position. Check that gauge indicates zero (0) psi.
11. Stop the pump.
B
"B" Port
(if equipped)
Locknut
Figure 10, Adjustment Details
B
2
1 = Advance
2 = Retract
3 = Neutral
Figure 11, Valve Handle Positions,
VM33, VM33L, VM43, VM43L
Relief Valve Body
(Do not Turn)
A
"A" Port
Set Screw
A
1
3
2
3
1 = Advance
2 = Retract
3 = Neutral
Figure 12, Valve Handle Positions, VM33M, VM43M
VM33L and VM43L Only
1.
Install a 0-15,000 psi [0-1,035 bar] gauge in the "A" port (see
Figure 10).
2.
VM43L Only: Install a 3/8" pipe plug in the "B" port and
torque to 25 ft-lbs [33 Nm].
3.
Loosen the relief valve locknut to permit adjustment of set
screw.
4.
Rotate the control valve handle to the neutral ("3") position.
See Figure 11 for valve positions.
5.
Start the pump and allow the oil to warm.
6.
Rotate the control valve handle to the advance ("1") position.
Allow pressure to build.
7.
To increase pressure: With the pump running, SLOWLY turn
the relief valve set screw clockwise until "A" port pressure
increases to the desired setting.
NOTE: A pilot-operated check valve in the locking valve
block will prevent the pressure from dropping when the set
screw is turned counter-clockwise. To lower the pressure
setting, follow the procedure in steps 8a through 8e.
8.
To decrease pressure:
a.
Be sure the pump is running.
b.
Rotate the control valve handle to the retract ("2")
position momentarily. Then, rotate the handle to the
neutral ("3") position. This will activate the pilot-operated
check valve and relieve pressure at the "A" port.
c.
Turn the relief valve set screw counter-clockwise one
turn.
d.
Rotate the control valve handle to the advance ("1")
position.
e.
SLOWLY turn the relief valve set screw clockwise until
"A" port pressure increases to the desired setting.
9.
When the desired pressure setting is reached, lock the set
screw with the locknut. DO NOT overtighten.
10. Before turning off pump, rotate the control valve handle
momentarily to the retract ("2") position to relieve pressure
at the "A" port. Then, rotate the handle to the neutral ("3")
position. Check that gauge indicates zero (0) psi.
11. Stop the pump.
10
A
B
1
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