50H Press
2/2014
4
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.
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
CAUSE
SOLUTION
Oil leaking from
piston oil seal.
1) Reservoir is over filled. *
2) Piston Packing is worn or damaged.
1) Drain excess oil.
2) Replace Piston Packing.
Press will not hold
pressure.
Press will not build
rated tonnage.
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) 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.
Oil leaking from
pump plunger
1) Packing Nut Loose.
2) Worn Packings.
1) Tighten Packing Nut.
2) Replace packings.
Oil leaking from
release valve rod
1) Valve Rod Packing Nut is Loose
2) Packings are worn.
1) Tighten Packing Nut.
2) Replace Packings.
Pump handle drifts
up.
Defective Check Ball or Check Ball
Spring.
Clean Check Ball, Reseat.
Replace Spring.
Ram will not return.
Return Spring damaged.
Piston is bent or damaged.
Piston Packing is defective.
Replace Spring.
Replace Piston.
Replace Piston Packing.
* Note: If press leaks around the ram but holds pressure the reservoir has been overfilled.
724 Robbins Road
Grand Haven, MI 49417
Phone: 616-842-7110 800-937-3253
Fax: 616-842-0859 800-846-3253
Web:
www.dakecorp.com
E-mail:
