1. Disconnect electrical power to pump.
2. Disconnect air supply and vent all air lines to
release pressure or vacuum.
3. Mark the orientation of the ports so cover will be
reinstalled correctly.
4. Remove screws from the head of the pump.
Remove the head of the pump.
5. Mark orientation of valve plate(s). Remove valve
plate(s).
6. Remove and discard old cups(s), retainer screws,
cylinder O-ring(s), head O-ring(s), valves and valve
retainers.
7. Install new cup(s) on rod(s) facing up.
8. Reinstall retainer plates.
9. Apply a thread locking compound (Loctite 222) to
retainer screws. Torque screws to 34-38 in. lbs.
10. Carefully install cylinder(s) over cup(s) at an angle to
avoid damaging cup(s).
11. Clean valve plates with water based solvent. Take
care to not scratch valve seats.
12. Install valves and valve retainers. Check that the
orientation with the ports is correct.
13. Apply a thread locking compound (Loctite 222) to
retainer screws. Torque screws to 10-13 in. lbs.
14. Install cylinder O-ring(s) in the bottom of valve
plate(s).
15. Check that the orientation of valve plate(s) with the
ports is correct.
16. Install head O-rings in the O-ring grooves on top of
valve plate.
17. Reinstall head over valve plate(s) checking that
orientation with ports is correct.
18. Torque screws to 50 in. lbs.
Check that all external accessories such as relief valves
and gauges are not damaged before
re-operating product.
If pump still does not produce proper vacuum or
pressure, send unit to a Gast Authorized Service Facility
for repair.
Gast finished products, when properly installed and operated under normal conditions of use, are warranted by Gast to
be free from defects in material and workmanship for a period of twelve (12) months from the date of purchase from
Gast or an authorized Gast Representative or Distributor. In order to obtain performance under this warranty, the buyer
must promptly (in no event later than thirty (30) days after discovery of the defect) give written notice of the defect to
Gast Manufacturing Incorporated, PO Box 97, Benton Harbor Michigan USA 49023-0097 or an authorized Service
Center (unless specifically agreed upon in writing signed by both parties or specified in writing as part of a Gast OEM
Quotation). Buyer is responsible for freight charges both to and from Gast in all cases.
This warranty does not apply to electric motors, electrical controls, and gasoline engines not supplied by Gast. Gastʼs
warranties also do not extend to any goods or parts which have been subjected to misuse, lack of maintenance,
neglect, damage by accident or transit damage.
THIS EXPRESS WARRANTY EXCLUDES ALL OTHER WARRANTIES OR REPRESENTATIONS EXPRESSED OR
IMPLIED BY ANY LITERATURE, DATA, OR PERSON. GASTʼS MAXIMUM LIABILITY UNDER THIS EXCLUSIVE
REMEDY SHALL NEVER EXCEED THE COST OF THE SUBJECT PRODUCT AND GAST RESERVES THE RIGHT,
AT ITS SOLE DISCRETION, TO REFUND THE PURCHASE PRICE IN LIEU OF REPAIR OR REPLACEMENT.
GAST WILL NOT BE RESPONSIBLE OR LIABLE FOR INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
however arising, including but not limited to those for use of any products, loss of time, inconvenience, lost profit, labor
charges, or other incidental or consequential damages with respect to persons, business, or property, whether as a
result of breach of warranty, negligence or otherwise. Notwithstanding any other provision of this warranty, BUYERʼS
REMEDY AGAINST GAST FOR GOODS SUPPLIED OR FOR NON-DELIVERED GOODS OR FAILURE TO FURNISH
GOODS, WHETHER OR NOT BASED ON NEGLIGENCE, STRICT LIABILITY OR BREACH OF EXPRESS OR
IMPLIED WARRANTY IS LIMITED SOLELY, AT GASTʼS OPTION, TO REPLACEMENT OF OR CURE OF SUCH
NONCONFORMING OR NON-DELIVERED GOODS OR RETURN OF THE PURCHASE PRICE FOR SUCH GOODS
AND IN NO EVENT SHALL EXCEED THE PRICE OR CHARGE FOR SUCH GOODS. GAST EXPRESSLY
DISCLAIMS ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE OR PURPOSE WITH
RESPECT TO THE GOODS SOLD. THERE ARE NO WARRANTIES WHICH EXTEND BEYOND THE DESCRIPTIONS
SET FORTH IN THIS WARRANTY, notwithstanding any knowledge of Gast regarding the use or uses intended to be
made of goods, proposed changes or additions to goods, or any assistance or suggestions that may have been made
by Gast personnel.
Unauthorized extensions of warranties by the customer shall remain the customerʼs responsibility.
CUSTOMER IS RESPONSIBLE FOR DETERMINING THE SUITABILITY OF GAST PRODUCTS FOR CUSTOMERʼS
USE OR RESALE, OR FOR INCORPORATING THEM INTO OBJECTS OR APPLICATIONS WHICH CUSTOMER
DESIGNS, ASSEMBLES, CONSTRUCTS OR MANUFACTURES.
This warranty can be modified only by authorized Gast personnel by signing a specific, written description of any
modifications.
WARRANTY
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