Dake 25H Instructions And Parts List page 4

HYDRAULIC – Relieve all hydraulic pressure before servicing press. Turn the red release handle to relieve
pressure.
SPRING PRESSURE – Clamp ring on bottom of piston must be in place before removing cylinder.
GRAVITY – Hoist & table channel. Always place table pins under the table channels first then install remaining
pins. Always release pressure on the cable before using press.
TROUBLE SHOOTING – DAKE HAND HYDRAULIC PRESSES
PUMP PACKING LEAKAGE
If oil leaks past the pump packing, tighten the pump packing nut (551) until pump handle works hard, then
slack off just enough to cause the handle to stay in position by itself. After long periods of operation, it may be
necessary to install new pump packings.
LUBRICATION
Keep all working parts of the press well oiled for easier operation. Also keep a light film of oil over the entire
surface of the ram to prevent rust.
IF PRESS DOES NOT HOLD PRESSURE
This condition is nearly always caused by dirt under pressure ball valve part number (586). See workhead
assembly drawing. To remedy this condition, first remove the reservoir drain plug and drain off all the oil in the
reservoir. Next, remove parts, 3/8" pipe plug (588), check valve spring (579) and valve ball (586) then clean
out port hole and valve seat thoroughly. Replace and using a small piece of brass rod as a drift, tap the brass
rod lightly to seat the ball properly. Replace spring and plug using extreme care to prevent dirt from entering.
Replace the drain plug and refill the reservoir with clean filtered oil.
If above procedure does not correct the condition, air may be present in the chamber above the piston and
should be removed as directed in Filling Press with Oil paragraph III.
SYMPTOM
Oil leaking from
piston oil seal.
Press will not hold
pressure.
Press will not build
rated tonnage.
Oil leaking from
pump plunger
Oil leaking from
release valve rod
Pump handle drifts
up.
Ram will not return.
* Note: If press leaks around the ram but holds pressure the reservoir has been overfilled.
25H Press
CAUSE
1) Reservoir is over filled. *
2) Piston Packing is worn or damaged.
1) Check Ball is contaminated.
2) Ball and Seat have poor contact.
3) Piston Packing is worn or damaged.
1) Pump Plunger Leather is worn or
damaged.
2) See 1,2,3 Above.
3) Gauge is defective.
1) Packing Nut Loose.
2) Worn Packings.
1) Valve Rod Packing Nut is Loose
2) Packings are worn.
Defective Check Ball or Check Ball
Spring.
Return Spring damaged.
Piston is bent or damaged.
Piston Packing is defective.
1) Drain excess oil.
2) Replace Piston Packing.
1) Remove and clean Check
Balls and Seats.
2) Reseat Ball on Seat.
3) Replace Piston Packing.
1) Replace Pump Plunger
leather.
2) See 1,2,3 Above.
3) Replace Gauge.
1) Tighten Packing Nut.
2) Replace packings.
1) Tighten Packing Nut.
2) Replace Packings.
Clean Check Ball, Reseat.
Replace Spring.
Replace Spring.
Replace Piston.
Replace Piston Packing.
4
SOLUTION
10/2015