Flowserve 400-D Assembly, Operation And Maintenance Manual page 10

Care and Maintenance
5. To avoid damage to the O-Ring, carefully screw the
By-Pass Valve into the Body until the O-Ring engages
the Body. Screw the valve in ½ turn, and unscrew ¼
turn. Repeat this procedure until the O-Ring has
entered the Body and the By-Pass Valve has seated.
CAUTION: If hydraulic fluid is present in
the By-Pass Valve cavity of the Body, fluid
back pressure may shear the O-Ring and the
O-Ring will have to be replaced.
6. After installing a new By-Pass Valve, recharge the
gun with hydraulic fluid as described in this brochure.
Floating Piston Replacement
1. Remove the Sealant Barrel Cap (26) and open the
By-Pass Valve (12).
2. Push Piston Assembly to bottom of Sealant Barrel (24)
with Handle (1). Clean the Handle and replace.
3. Remove the Sealant Barrel from the gun (see
instructions listed in Sealant Barrel Replacement).
4. Remove the Floating Piston (41) from the Sealant
Barrel using Piston Pulling Tool 47517.
5. Place the Floating Piston into a vise and disassemble
using Spanner Wrench 47518.
6. Replace the O-Ring (42) and Nylon Cups (35).
7. Tighten the assembly using two spanner wrenches.
8. Replace the Floating Piston using Floating Piston Guide
Tool 47520. The assembly should be positioned flush
with the bottom of the Sealant Barrel.
9. After installing the Floating Piston, recharge the
gun with hydraulic fluid as described on page 8 of
this brochure.
10 10
(cont.)
Sealant Change-out
1. Remove the Sealant Barrel Cap (26), complete with
hose assembly.
2. Force Piston Pulling Tool 47517 into the center of
the sealant in the Sealant Barrel (24) and push until
the tool is in contact with the Floating Piston (41).
3. Screw the tool into the Floating Piston, open the
By-Pass Valve (12), and pull the piston out of the barrel
until the assembly is flush with the end of the barrel.
4. Remove the Piston Pulling Tool and scrape the
existing sealant from the end of the Floating Piston.
5. Follow instructions for Loading the 400-D Hand Gun
with Sealant as listed in this brochure.
6. Attach a sealant fitting to the Giant Button Head
Coupler (44) and purge old sealant from the hose by
operating the gun until new sealant is pumped through
the fitting.
Factory Repair Service
Factory Repair Service is available from Flowserve Nordstrom
Valves. Consult your Authorized Distributor or Nordstrom
Customer Service for more details.
Flow Control
Nordstrom Valves
400-D HYDRAULIC HAND GUN