Verified Diagram Scope
Part numbers and names are restricted to the current category and Titan Commander documentation.
Diagnosis Before Replacement
Every recommendation begins with inspection of genuine assembly components.
Six-Card Maximum
The commercial section contains no more than six verified component cards.
Verified Commander Links
Navigation uses confirmed machine-family and assembly-category destinations only.
Assembly Overview
Titan’s 155-559 diagram covers the pump block, paired packing sets, upper and lower springs, displacement rod, piston-seat assembly, cylinder, ball cage, inlet ball and foot valve. The documented motor-pump ratio is 45:1 with the 742-series motor.
Verified component index: 155-907, 138-053, 155-982, 155-921, 155-932, 155-991
Functions Supported by the Assembly
Primary Assembly Function
Pump block performs a central function within this documented Commander system.
Pressure or Flow Support
Poly/leather packing set supports controlled pneumatic, fluid or structural operation.
Sealing and Retention
Displacement rod contributes to sealing, alignment, filtration, retention or stability.
Service Identification
The exploded page separates genuine service components from adjacent Commander systems.
Service Applications
Use this page for model identification, preventive inspection, targeted repair, assembly rebuilding, pressure or flow diagnosis and purchasing for Commander equipment that specifically uses this assembly.
High-Value Replacement Parts
Only components confirmed in the current Commander diagram or parts table are shown.
Titan 155-907 Pump block
Confirmed in the current Commander exploded diagram or parts table. Match the item callout and installed assembly before replacement.
Titan 138-053 Poly/leather packing set
Confirmed in the current Commander exploded diagram or parts table. Match the item callout and installed assembly before replacement.
Titan 155-982 Displacement rod
Confirmed in the current Commander exploded diagram or parts table. Match the item callout and installed assembly before replacement.
Titan 155-921 Piston seat assembly
Confirmed in the current Commander exploded diagram or parts table. Match the item callout and installed assembly before replacement.
Titan 155-932 Cylinder
Confirmed in the current Commander exploded diagram or parts table. Match the item callout and installed assembly before replacement.
Titan 155-991 Foot valve
Confirmed in the current Commander exploded diagram or parts table. Match the item callout and installed assembly before replacement.
Buying Guide
1. Confirm the machine
Record the complete Commander model and mounting configuration.
2. Confirm the assembly
Match the assembly title, item callout and part number.
3. Diagnose the symptom
Inspect connected air, fluid, filter, bleed and mounting systems.
4. Check availability
Do not assume an older documented part remains available or interchangeable.
Maintenance
Relieve pressure before service, inspect grounded high-pressure hoses, keep the assigned filter clean, maintain moisture-free air, use compatible cleaning materials and document recurring wear.
Repair Planning
Record the Commander model, ratio, mounting style, assembly number, item number, part number and symptom. Inspect neighboring components and determine whether individual service parts or a complete assembly best addresses the confirmed fault.
Fast Navigation
Extensive FAQ
What type of page is Commander 155-559 Fluid Pump Assembly Parts?
It is a exploded fluid-pump assembly parts page for the SPEEFLO Commander family.
Which parts are confirmed on the Commander 155-559 Fluid Pump Assembly Parts page?
Confirmed examples include 155-907 Pump block, 138-053 Poly/leather packing set, 155-982 Displacement rod, 155-921 Piston seat assembly.
Why must the complete Commander model be checked?
Commander equipment uses different motors, pumps, mounts, filters and accessories. Match the complete model and assembly number.
What should be inspected before replacing parts?
Relieve pressure and inspect packing sets 138-053, displacement rod 155-982, piston seat 155-921 before deciding that replacement is necessary.
Can similar Commander parts be interchanged?
Do not assume interchangeability. Confirm the exact documented part number, connection size, pressure rating and assembly.
What causes unstable operation?
Air leakage, restricted material flow, packing wear, valve contamination, filter blockage or loose mounting can produce unstable operation.
How should pressure loss be diagnosed?
Check air delivery, material pickup, the fluid section, outlet filtration and the pressure-relief path before replacing a component.
When should seals or packings be replaced?
Replace them after inspection confirms leakage, bypass, swelling, hardening, scoring damage or loss of sealing performance.
What maintenance reduces downtime?
Flush compatible material, inspect hoses, keep filters clean, maintain moisture-free air and record recurring wear.
How were internal links selected?
Only verified Commander machine-family and assembly-category destinations related to this page are included.
What information belongs on a repair order?
Record the complete model, mounting style, pressure ratio, assembly number, item number, part number and operating symptom.
Why diagnose before replacement?
Connected air, fluid, filter, bleed and mounting systems can create similar symptoms. Diagnosis avoids replacing a sound component.
Identify the Correct Commander Part Before Ordering
Use the machine, assembly diagram and operating symptom together to reduce mismatched orders.
- Complete Commander model number
- Assembly and item number
- Titan part number
- Operating symptom or component name